MYSQL :: Efficient Way To Left Join?

Specify Conditions For The Left Side Of A Multiple Left Join
I'm doing a left join that looks like this standard example:

SELECT t1.c1, t2.c2, SUM(t3.c3)
FROM t1
LEFT JOIN t2 ON t1.c1=t2.c1
LEFT JOIN t3 ON t1.c1=t3.c1
GROUP BY t1.c1

The problem is that I also want to specify a condition for selecting records from t1:

WHERE t1.c1='x'

so that only the records with that value in c1 will be returned on the left side of the join. I don't know where to put this in the SQL.

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Connecting Three Tables With Left Join And Ordinary Join
I have 3 Mysql tables:

Week (with columns day and hour)
Activity (with columns day, hour, activityid and ac_text)
Person (with columns name and activityid)

I would like to create a scheme showing the activities during a week sorted on days and hours. If I ignore the person table I can fix it with the statement:
Select …. From week left join activity on (week.day = activity.day) and (week.hour = activity.hour) order by day, hour

I can then make a loop (I am usin asp.net) that writes the activities.
My problem is when I try to combine the persons to the activtities in an given hour. How do I do that ? (activity.activityid = person.activityid).

I have a little extra question. When I make the join above and print the result (day, time and activity) there isn’t any output if no activity matches a given day and hour. How do I do when I always want to print day and hour and add activity where such exist.

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Outter Join, Inner Join, Left Join, Right Join
I don't see the point of making so many kinds of join, that drives me confusing reading the mysql document.

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LEFT JOIN? RIGHT JOIN? Multiple JOIN?
Simplifying this down to its basics, I'm using LEFT JOIN in a query but I'm not getting the results I want.

The tables are:
table services
service_id
service_name

table services_provided
service_id
service_date (date field)
cust_id
service_quantity

I need to select ALL services from the services table, and the number of services provided (by a specific customer, in a specific time frame) from the services_provided table, so that I can generate a list that shows services provided by that customer in the specified period of time

The query:

SELECT service_date, service_name, service_quantity
FROM services
LEFT JOIN services_provided ON services_provided.service_id = services.service_id
WHERE cust_id = $cust_id
AND MONTH(service_date) = 10
AND YEAR(service_date) = 2007
GROUP BY service_id
ORDER BY service_id
(Aside: The date to be selected varies - it may be the whole year, or may be a selection of months,such as 1, 2 or 3. This is determined dynamically in the script. The cust_id is determined by which customer is logged in.)

I'm pretty sure that the left join as I have it should return all services, even if there's no corresponding entry in the services_provided table.

But because of the WHERE clause, I don't get a complete list of all services -- if the customer doesn't have any entries for a particular service, that service doesn't come up in my results.

Do I need to change how I'm joining the tables, or join them twice? I'm sure I could do this with a nested query, but I'm trying to avoid that.

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Using LEFT JOIN Instead Of A Equi-JOIN
I have a SQL statement in some code I'm trying to get my head around.. I havent used SQL that much so I assume this is a newbie question: Why would someone use LEFT JOIN if they can simply construct the statement with equi-JOIN? The first statement uses left joins and the 2nd is my reconstruction using equi-JOINs.. so far they produce the same results (however it could be I dont have the right kind of test data) So to summarize my questions: Why do it using LEFT JOINS which I personally find harder to read over the equi-JOIN, 2nd Do they acutally produce the same result everytime?
1st (LEFT JOIN)
-------------------------------------------------------------
SELECT action.action,
summary.gatekeepercl,
branch.branch
FROM summary
LEFT JOIN action ON summary.action=action.id
LEFT JOIN branch ON summary.branch=branch.id
WHERE summary.gatekeepercl IN (506100,506101)
2nd (equi-JOIN)
---------------------------------------------------------------

SELECT action.action,
summary.gatekeepercl,
branch.branch
FROM summary, action, branch
WHERE summary.action=action.id
AND summary.branch=branch.id
AND summary.gatekeepercl IN (506100,506101)

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Upgrading: Replacing Commas With "INNER JOIN" In LEFT JOIN Queries
I've just upgraded from 4.1 to 5.0 and I'm very scared. So, no more comma-separated table names in queries with LEFT JOIN clauses are allowed? ( http://forums.devshed.com/mysql-help-4/having-unknown-column-in-on-clause-error-323495.html)

Each of those commas has to become ' INNER JOIN '. I have almost 400 left join queries spread out over a couple hundred files. I'm sure it's for the best, but oh is this task going to hurt! It looks like even a regular expression search & replace solution won't be feasible.

I'm sure I'm not the first person who had to do some mass replacing. Any suggestions? Am I dreaming thinking there might be a variable that can be set that will allow the "old" format? I'm sure I'm in store for other issues, but are any of them major syntax changes like this one?

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Left Join Help
Using MYSQL 4.0.13, debian linux

create table members (
id unsigned int autoincrement,
name
)

create table activity (
id unsigned int autoincrement,
description
)

create table history (
id unsigned in autoincrement,
date date,
member_id unsigned int,
activity unsigned int
)

What I need:
1) only records for a particular date
2) there should be at least one record for each activity
3) there may be multiples of the same activity on a given date
4) there may be multiples of the same member on a given date
5) not all members will be listed
6) the members.name result field may be NULL

SELECT history.date, activity.description, members.name
???
WHERE history.date = 'YYYY-MM-DD'

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Using LEFT JOIN
I have two tables which I am trying to perform a left join on.

table 1: master
columns | datatype
--------------------
masid | int(4)
maDesc | varchar(200)
maNote | varchar(200)

table 2: slave
columns | datatype
--------------------
asid | int(11)
masid | int(4)
uid | int(11)
cdate | datetime
title | text

my query is as follows

SELECT *
FROM `master`
LEFT JOIN `slave` ON master.masid = slave.masid
WHERE slave.uid = ? OR slave.uid IS NULL
ORDER BY master.masid DESC LIMIT 0, 30

I want to be able to display a row for each master.masid and then, depending
on whether a slave row exists that matches display a link to create on (this
is a php/mySQL project). Problem is it doesn't quite do what I want.
It only seems to return the one row with the highest master.masid if no
matching slave row exists for it, rather than listing all the masid rows for
which no matching slave row exists. It returns all the matching slave rows.

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A LEFT JOIN With LIKE?
I would like to use a "LIKE" condition in my LEFT JOIN statement.

At the moment I have something like:
SELECT * FROM page AS p LEFT JOIN item AS i ON p.url=i.url

Now I want to include the subpages from i.url. So if p.url is
"www.here.com/page"
it should also match if i.url is
"www.here.com/page/subpage.html"

So the new command should look something like:
SELECT * FROM page AS p LEFT JOIN item AS i ON p.url=i.url%

Can this be done? How?

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A LEFT JOIN With LIKE
I would like to use a "LIKE" condition in my LEFT JOIN statement.

At the moment I have something like:
SELECT * FROM page AS p LEFT JOIN item AS i ON p.url=i.url

Now I want to include the subpages from i.url. So if p.url is
"www.here.com/page"
it should also match if i.url is
"www.here.com/page/subpage.html"

So the new command should look something like:
SELECT * FROM page AS p LEFT JOIN item AS i ON p.url=i.url%

Can this be done? How?

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Left Join With LIKE
hey I'm trying to join two tables on whether one text field is inside another text field, is there someway to do this?
something along the lines of
table1.field1 LIKE '%' & table2.field2 & '%'

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LEFT JOIN
SELECT br.rid, br.title FROM {booking_resource} br LEFT JOIN {booking_schedule} bs ON br.rid = bs.rid WHERE bs.timestamp != [timestamp for a new booking];

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LEFT JOIN With MIN() - Please Help
I just can not get my head around this, so any help is appreciated.

I am building a real estate web site and need to look up properties to list them.

I need to get an image from the jos_mh_images table if one exists. If not - I still want to get the content from jos_mh_properties - thus the LEFT join.

Here is a simplified version of my query:

SELECT p.*, MIN(i.image_name_id), i.image_ext
FROM jos_mh_properties AS p
LEFT JOIN jos_mh_images AS i ON p.id = i.property_id
WHERE p.published = 1
GROUP BY p.id
LIMIT 0, 10
My issue is that the query returns the correct MIN i.image_name_id but the returned i.image_ext is not from the same row.

I would like to select the whole row from jos_mh_images where i.image_name_id is smallest and property_id = p.id

My original query has lots of other LEFT JOINS that works great - they have been removed to make the question easier to understand.

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Using A WHERE With LEFT JOIN
My problem seems pretty simple, but I'm having a tough time figuring out a SELECT statement that will do what I want.

Basically, I have two tables that look like this:

table1
userid
1
2
3
4
5
6
7

table2
myid addedid
2 4
2 5
What i need to do is find a way to list the users in table1 that are NOT listed in 'addedid' in table two.

This is the basic select statement that I'm using:

SELECT table1. * , table2. * FROM table1 LEFT JOIN table2 ON table1.userid = table2.addedid

Which lists the results like this:

userid myid addedid
1 null null
2 null null
3 null null
4 2 4
5 2 5
6 null null
7 null null
What I want to do is display only the results that have "myid" and "addedid" as null. I tried adding "WHERE users.userid!=adds.addedid" to the original SELECT statement's ending, but it doesn't work. I also tried adding "WHERE "myid=null", but that doesn't work either. ?

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Right And Left Join
So I have Table named Global and one named Personal. i need to Get All Records from both tables that match a single userid. These tables may have a linking attribute (globalid to id) But it may not exist as well. The only way I have figured out how to get the correct data is to utilize 2 seperate queries. Can I get these to run a one?

CREATE TABLE `global` (
`id` int(11) unsigned NOT NULL auto_increment,
`userid` int(11) unsigned NOT NULL,
`value` int(11) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=8245;

CREATE TABLE `personal` (
`id` int(11) unsigned NOT NULL auto_increment,
`userid` int(10) unsigned NOT NULL,
`globalid` int(11) unsigned default NULL,
`value` int(11) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=379 ;
Now here is some Data

INSERT INTO `global` (`id`, `userid`, `value`) VALUES
(2442, 13, 630),
(3017, 13, 0),
(3108, 13, 78),
(3109, 16, 2220),
(3110, 16, 2220);

INSERT INTO `personal` (`id`, `userid`, `globalid`, `value`) VALUES
(324, 13, 2442, -5),
(367, 13, 3017, 10),
(378, 13, NULL, 25),
(336, 12, NULL, 2543);

And here is the current queries I am running.

SELECT g.value, p.value as PValue
FROM `global` g
LEFT JOIN personal p ON p.globalid = g.id
WHERE g.userid = 13

SELECT g.value, p.value as PValue
FROM `global` g
RIGHT JOIN personal p ON p.userid = g.userid AND p.globalid = g.id
WHERE p.userid = 13 AND g.id is null

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Left Join Doesn't Seem To Do It's Job?
First post to sitepoint - and it's probably the easiest solution (I just can't see it!).

I have a query between two tables (A and B). A lists all the types, and B has the occurences of these types. Example structures below:

Table A
======
type_id
type_desc

Table B
======
occurence_id
type_id
vaidator_id

MySQL
SELECT t.type_id, t.type_desc, COUNT(o.validator_id) AS validated, COUNT(o.occurence_id) AS total
FROM type AS t NATURAL LEFT JOIN occurence AS O
GROUP BY t.type_id
ORDER BY t.type_id ASC

What I would expect to happen is evey row in the type table to be returned with either nulls or the counts of the relevant values from the occurence table.

What I'm actually getting is the correct count, but only for the items that have that have a value (as if I was using a standard join). For example:

I'm getting this:

type_id type_desc validated total
================================
1 Type 1 5 7
3 Type 3 0 1

Where I'm expecting this:

type_id type_desc validated total
================================
1 Type 1 5 7
2 Type 2 0 0
3 Type 3 0 1

I get the same result with NATURAL LEFT JOIN as I do with LEFT JOIN... ON... .

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UPDATE And LEFT JOIN
I hope this is the right place to post, but, I am having a problem with
an UPDATE command and a LEFT JOIN, I am using something like:

UPDATE table_a LEFT JOIN table_b ON table_a.field1=table_b.field1 SET
table_b.field6='1' WHERE table_a.field2='1';

Something along those lines. Anyway, from what I can see on various web
sites, documentation, etc, I think it should work, however, I keep getting
this error...

#1064 - You have an error in your SQL syntax near 'LEFT JOIN table_b ON
table_a.field1 = table_b.field1 SET table_b.field6 = '1' ' at line 1

Any idea why this doesn't work? I tried rewriting it not to use the LEFT
JOIN, but, still received SQL syntax issues. I need to change a field in
table_b, but the only way I know which records to change is a field in
table_a.

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Is It Possible To LEFT JOIN A Table To Itself?
Is it possible to LEFT JOIN a table to itself?

I want to see all records in a table where the year of the sales date is 2003 and where the salesman sold an item to a customer to which he did not sell that item to in 2002. Code:

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LEFT JOIN Limitations ??
I have a strange problem, maybe some of you will be able to explain me
something. I use LEFT JOIN as a substitute for subselects. It's true
that many subselects can be rewriten using LEFT JOIN. I have made a
query which use LEFT JOIN statement and... when there are many LEFT
JOIN's (over 3) on the same table MySQL execute this query very long
time... few hours or more. Maybe there is something wrong with my table
structures... Are there any limitations for LEFT JOIN ?? Code:

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DELETE And LEFT JOIN
Trying to DELETE orphans.I can successfully:

SELECT GroupID FROM Groups LEFT JOIN Users ON UsersID = UserID WHERE
UsersID IS NULL;

but when I try:

DELETE FROM Groups LEFT JOIN Users ON UsersID = UserID WHERE UsersID
IS NULL;

I get:

ERROR 1064: You have an error in your SQL syntax near 'LEFT JOIN Users
ON UsersID = UserID WHERE UsersID IS NULL' at line 1

I can also successfully:

DELETE FROM Groups WHERE GroupID = '<specific>';

I have been trying several different methods, but a little hesitant to
go to far, considering I'm DELETEing. I have been checking out past
postings, but nothing that fits this situation.

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Left Join In Case Of
Suppose you have a table_ex like:

id nuber1 chr ( = a or b)
1 1000 a
2 1001 a
3 1002 b
4 1003 a
etc..

Now, is it possible to have a query like:

LEFT JOIN tablea if chr=a ON table_ex.number1=tablea.id
OR
LEFT JOIN tableb if chr=b ON table_ex.number1=tableb.id

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INSERT On LEFT JOIN
I split the table on my spider db to normalise and I find myself writing stuff like this:

function get_hostid($host){

global $db;
$host=mres($host);
$query='SELECT hostid FROM hosts WHERE host = ''.$host.''
';
$result=mysqli_query($db,$query);
if($row=mysqli_fetch_assoc($result)){
mysqli_free_result($result);
return $row['hostid'];
}
mysqli_query($db,'INSERT INTO hosts (host) VALUES (''.$host.'')');
return mysqli_insert_id($db);
}

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Left Join Vertically
I already know how to LEFT JOIN table results together horizontally. But, how about vertically? In other words, I have two tables that are similar. Is it possible to design a query so that it returns matching results from both tables?
More detail:

Table A categories: 'id', 'cost', 'label', 'parameterA'

Table B categories: 'id', 'cost', 'label', 'parameterB', 'parameterC'

Would it be possible to run a select that would return results like this (with matching entries from both tables):

Type (which table the item came from), id, cost

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Joins And Join Left
Can someone please explain to me how they work?
I was looking over the mysql.com web site for joins and i don't understand it.
Is it possible if someone show me a VERY simple example and how joins actually work.

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Left Join 2 Times
SELECT f.id as id, f.forum_name as forum, f.forum_desc as description,
count(forum_id) as threads, u.name as mod
FROM forum_forum AS f
LEFT JOIN forum_posts AS p
ON f.id = p.forum_id
AND p.topic_id=0
LEFT JOIN forum_users AS u
ON f.forum_moderator = u.id
GROUP BY f.id

Output: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'mod FROM forum_forum AS f LEFT JOIN forum_posts AS

Does this query contain any syntax errors? Can mysql perform left join 2 times?

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Left Join On More Than Three Tables
I am comfortable joining two tables to return data from several columns of each, and I'm comfortable left joining three tables when the second table is a "link" table that connects the primary key of the first table records with the foreign key of the third table's records.

My new project involves seven tables. Four of the tables are "data tables" and contain member's contact info. The first and center piece of those four tables lists the member_id, along with last name, first name and gender. The other three data tables have two columns each and list city_id and city, email_id and email_address, and phone_id and phoneNumber.

The remaining three tables of the seven are what I call "link" tables" (I never learned the real name for them). They simply link or connect the member_id (and ergo the member) to either that person's city, email address or phone number in the three smaller data tables. Each link table has two columns, one of which is the member_id, and the second of which is either the city_id, email_id or phone_id, depending on the table.

I set it up this way because (I think) proper db design specifies separate tables if not everyone has a phone, or email, or... It prevents redundancy, and it prevents empty fields in data rows -- all the things we love about normalization.

However, I don't know how to write a SELECT query that properly connects the seven tables so that I can query a person's name, gender, city, phone and email address. Name and gender come from the first table, and city, phone and email come from the other three data tables via connection with the three link tables. Can you point me in the right direction, or suggest an online tutorial that covers this (for me) complex design?

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Left Join Query
I have this query

SELECT user.user_id, email, password, full_name, company_name,
first_login_date, last_login_date, first_draft_date, last_draft_date,
first_submit_date, last_submit_date, rowc.*
FROM user LEFT JOIN rowc ON rowc.user_id = user.user_id
WHERE user.user_type = 'USER' ORDER BY user.email

Which returns all records in user table plus rowc records if there are matches in the user id.

but user.user_id is null when there are no matching recordings in the rowc.
Isn't left join meant to pull all the records in the user table? What am I doing that is wrong here?

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Subselect/left Join
I have a table like this

| ID | THING | NUMBER |
---------------------------------------------------------------
| 1 | white | 1 |
| 2 | white | 2 |
| 3 | green | 1 |
| 4 | green | 3 |
| 5 | brown | 1 |
| 6 | brown | 4 |

and I want to get just white back if I know two numbers are 1 and 2 or green back if I know the nubmers are 1 and 3.

Its mysql 4.1 so I am allowed subselects or left joins. I am drawing a blank!?

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Mass Left Join
I would like to join a lot of tables but they all share the same structure. All of them have the same id column. I found a solution, but I'm almost sure there is a more efficient way. My solution is like this:

select id,c1,c2,c3,c4,...,c29 from t1 left join t2 using (id) left join t3 using (id) left join t4 using (id) ...

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Left Outer Join
I have just converted an app from MS Access to MySql. I have using Hyperion Performance to run my queries. I have 4 tables and main table and three look up tables. when I do a left outer join to one table the query runs fine, however when I do the left outer join to more then one table it error out.

with this error message: You have an error in your sql syntax check the manual that corresponds to your Mysql server version for the right syntax to use near {oj left outer join rc_availability Al4 Al1.rc=Al4.rc} where al1.msa=al at line 1 Code:

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How To Use Left Join For 3 Or More Tables.
I am using mysql 4.1

SelectCustomer NameCustomer POSalesOrder POProduct Name

1.CHARLES 270086 05480 BCSLS
2.CHARLES 270086 05481 BCSLS
3.
4.

4 tables totally connected.

Transaction tables - 2
salesordermaster
salesordertran

master tables - 2
customer
products

i ll fetch the customer name from customer master table with reference from salesordermaster.
i ll fetch the product name from the product master table with reference from salesordertran.

see , the customerpo are same for above 2 records, it is from salesordermaster table.
and salesorderpo are different for above 2 records, it is from salesordertran table.

if none of the records are in salesordertran table, i need the display atleast customername and customerpo which is from salesordermaster.

(so far, i had tried with left join between salesordermaster and salesordertran, but salesordertran reference the product master table for the productname, so the resultant query fetches some records with cross product. is there any iff conditions in mysql?? can be used it here?)

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LEFT OUTER JOIN + WHERE ?
I have problem with constructing a SQL query. I have tables with data:

mysql> SELECT * FROM category;

+----+-----------+
| id | is_active |
+----+-----------+
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
+----+-----------+

4 rows in set (0.00 sec)

mysql> SELECT * FROM category_i18n;

+------------------+----+---------+
| name | id | culture |
+------------------+----+---------+
| Agroturystyka | 1 | pl_PL |
| Bed&breakfast | 2 | pl_PL |
| Hotel | 3 | pl_PL |
| Obiekt zabytkowy | 4 | pl_PL |
+------------------+----+---------+

4 rows in set (0.00 sec)
Category table includes category id and is_active status. Category_i18n has category names translations for several cultures and the id field is a foreign key.

Now I'd like to get result like this:
mysql> SELECT c.id, ci.name FROM category c LEFT OUTER JOIN category_i18n ci ON c.id=ci.id WHERE ci.culture='pl_PL' OR ci.culture IS NULL;

+----+------------------+
| id | name |
+----+------------------+
| 1 | Agroturystyka |
| 2 | Bed&breakfast |
| 3 | Hotel |
| 4 | Obiekt zabytkowy |
+----+------------------+

4 rows in set (0.00 sec)
And in this case (culture='pl_PL') it works fine. But when I change culture to 'en_US' I don't get any results. How to change my query to select all ids from category table and join name field from category_i18n table but with culture condition. If there is no translation there should be a NULL value.

Result I'd like to get for culture='en_US':

+----+------------------+
| id | name |
+----+------------------+
| 1 | NULL |
| 2 | NULL |
| 3 | NULL |
| 4 | NULL |
+----+------------------+

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Help With LEFT JOIN & Subquery
It seems my original plan for this query doesn't work, and I'm not sure how to change it so that it would. Any ideas? I don't think much detail is needed about the tables (if so let me know and I'll post up more info) - I basically just want to do a left join of one table with a subquery (another table, but only rows with group_id=3).

Since I'm working with MySQL 4 views/stored procs aren't an option. Is my syntax just wrong, or do I need to approach this issue differently?

My original query:

SELECT * FROM modules LEFT JOIN (SELECT * FROM permissions WHERE permissions.group_id = 3) AS perm ON modules.id = perm.module_id

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Conditions On Left Join
I'm having trouble constructing this left join query. I want to retrieve all rows from tProducts, and relevant matches from pictures, however what I have got just jams up the server and I have to restart. Am I doing it wrong?

SELECT prodCode, prodName
FROM tProducts LEFT JOIN pictures
ON productID = relProdId
AND prodCode = 'SF2'

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NOT IN Vs LEFT JOIN + Is NULL
I have two queries which should give me the same results:

A) DOESN'T WORK

SELECT K.computer_nr, K.a_nr
FROM kruispunt K
WHERE K.computer_nr NOT IN (
SELECT DISTINCT L.computernr
FROM logboek_msg L
WHERE L.tijdstip_registratie >= '2009-04-01 11:50:25'
)

B) WORKS

SELECT K.computer_nr, K.a_nr
FROM kruispunt K
LEFT JOIN logboek_msg L ON (
K.computer_nr = L.computernr
AND L.tijdstip_registratie >= '2009-04-01 11:50:25'
)
WHERE L.id IS NULL

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Left Outer Join
After the LEFT JOIN statement and the ON statement.

1 LEFT JOIN
2 ON
3 WHERE ? (You cant's seem to be able to use 'where') What can you use to specify or narrow your selection.

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Index And Left Join
I have a problem with getting a index to work in MySQL 4.1 or later. It works perfectly in 4.0.24 but it does not work in 4.1 and later releases, I have verified it in 4.0.24(which works) and in 4.1.16, 4.1.19, 5.0.21. I'm running Windows XP and mysqld-nt with default installation. Code:

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Left Join To Get The 1 Most Recent
Firstly table structure - 1 user has multiple status records. When a new status record is created it gets the current datetime inserted into 'date_created'.

user
user_id
site_id

status
status
notes
date_created

I wish to display a list of all users and show beside them their current/most recent status record. Here is my code currently:

SELECT user.*, status.date_created, status.status, status.notes,
DATE_FORMAT(status.date_created,'%l:%i %p') as last_updated_time,
DATE_FORMAT(status.date_created,'%e/%c') as last_updated_date
FROM user
LEFT JOIN status ON status.user_id = user.user_id
WHERE user.site_id = 1
GROUP BY user.user_id
ORDER BY
CASE user.user_id WHEN 8 THEN 0 ELSE user.user_id END

Currently via the LEFT JOIN and GROUP this does display a list of all users with 1 status record per user but it's simply the first status record in the table (ordering by id i guess), not the most recent. How can I get it to display the most recent instead, based on date_created. I've tried adding ordering to the left join but this returned an error.

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Left Join Conditions
Two tables.

table1, table2

Table 1 contains all unique items.
Table 2 contains x references to table 1, unique by customerId

I want to do a join onto table2 where table1.id = table2.table1Id AND table2.customerId = the user's ID

I can't quite figure out how to work in the idea of an AND into my left join. Unless both those conditions are two, I don't want any data from table2.

Only solution I can think of so far is to just left join on the id's, but select the customerId from table2, and as I loop through, check to see if it's supplied and the right id, and keep track of duplicate items from multiple customers myself.

Suggestions?

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Left Join Probelm
I'm not all that skilled when it comes to using LEFT JOIN, so I'm not even sure if what I require can be done! This is what I tried to do:

$tinfo = mysql_query("SELECT
U.username,T.game,T.club,T.date,T.status,T.fee,T.players,T.winner,S.name,S.rules
FROM ct_info T LEFT JOIN users U ON U.id=T.host
LEFT JOIN styles S ON S.id=T.style
WHERE id=$tjump");

$tinfo = mysql_fetch_array($tinfo);

T.ct_info stores all information on the tournament including the Host's ID# (T.host). So I wanted it to LEFT JOIN with users U to get their username (U.username) - so I did ON U.id=T.host.

ct_info also records the STYLE ID# of the tourmament. the table "style" holds the name and the rules of each style (ID, NAME, RULES) so I did a further LEFT JOIN of styles S with S.id=T.style.

All this returns is an error of invalid arguement. I think I may have my LEFT JOIN's in wrong order or something but have tried numerous different ways and it just won't happen for me.

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Using 'AND' With A LEFT JOIN
I have the following (simplified) tables in a large database.

table: technology
fields: id, name, description

table: tech_area
fields: id, tech, area

I'm trying to find the set of technologies that cover multiple areas, say area = 6 AND 8.

Obviously a query like "SELECT name FROM technology LEFT JOIN tech_area ON technology.id=tech_area.tech WHERE area=6 AND area=8" isn't going to work because each row checked will have only one area.

Is there a better way to structure the data? Or is there a way to use a subquery to transpose the tech_area results into a row that contains all the areas? Or am I going to have to return all matches from tech_area and do the search in PHP?

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LEFT JOIN Logic
I have several database that I need to link with a left join. I thought and thought on this and I believe the method I am going to use is the best. Basically I have 3 Tables that need to use a LEFT JOIN. A Members Table, A Group Table and a RSVP table.

When a member RSVP it insert a record into the RSVP TAble with MemberID, EventID and Their Status.

I am setting up a form where the Event Planner Can Change Members RSVP status. I made it very simple with 2 Drop Down Boxes. One that has a list of everyone that has RSVPed Yes. The Planner can just select the name click go and the Member will automatically be set to NO on RSVP.

The other Drop Down will be a List of Members names that have RSVPed No,Like, Not Likely or Nothing at all. (If they have no reponse then there won't be a record for them in the RSVP table)

Here is a sample of my non-working code.

PHP

SELECT rsvp.attending, leaguemembers.nick, members.firstname, members.lastname, members.memberid FROM members, leaguemembers LEFT JOIN rsvp USING (memberid) WHERE rsvp.eventid = 'xxx' AND rsvp.memberid = members.memberid AND members.memberid = leaguemembers.memberid ORDER BY members.firstname

This Query Only Returns A Result for people that have RSVP something and not members that have not responsed.

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Left Join In V. 4 Not Compatible
I have the following left join that works fine in v. 5 of mysql but does not work in v. 4. can someone help me simplify the query to where it will run in both?

$sql = 'select * from partoption left join (select optionID, value as price from perfdataoption where perfdataID = 5) pricedata on pricedata.optionID = partoption.partID where groupID ='.$row['groupID'];

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LEFT JOIN, Need To Get All Fields In A Row
HTML
SELECT * FROM table_1 LEFT JOIN table_2 ON table_1.type=table_2.t_id WHERE card_id (table_1)=5
a problem I have is the following:
Only the t_id from table_2 gets retrieved, whereas I actually have to retrieve all the fields from table_2...how could I retrieve all the fields? Do I need to add conditions or use a different kind of join?

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Mysql 5 Left Join
I am trying to upgrade to mysql 5 and have run into a problem.

I have this query that runs perfectly on mysql4:

SELECT product.title, product.alias, product.descr, pop_marks.special_char as mark, categories.alias as category_alias FROM product , product_categories, categories, featured_products LEFT JOIN pop_marks ON pop_marks.markid = product.mark WHERE featured_products.productid=product.productid AND product_categories.productid=product.productid AND product_categories.categoryid = categories.categoryid GROUP BY product.productid ORDER BY RAND() LIMIT 1
WHen I run this same query on mysql it tells me "Unknown column 'product.mark' in 'on clause'". The database is an exact copy from the mysql 4 one (I uploaded from an exported .sql). The column is there I can see it.

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Left Join Problem
TABLES:

setup_main
sid (primary)
sdata1
sdata2

output1
oid
sid
outdata
outdate_end

output2
oid
sid
outdate_end

output3
oid
sid
outdata
outdate_end

Query:

SELECT
s.sid, s.sdata1, s.sdata2
FROM
((setup_main AS s
LEFT JOIN
output1 AS o1 ON s.sid = o1.sid)
LEFT JOIN
output2 AS o2 ON s.sid = o2.sid)
LEFT JOIN
output3 AS o3 ON s.sid = o3.sid
WHERE
(
o1.outdate_end
BETWEEN
'PREVDATE' AND 'CURDATE'
OR
o2.outdate_end
BETWEEN
'PREVDATE' AND 'CURDATE'
OR
o3.outdate_end
BETWEEN
'PREVDATE' AND 'CURDATE'
)

The query returned results not according to date range (PREVDATE and CURDATE), may I ask for a help on how do I achieve having a results based on the given PREVDATE and CURDATE variables...

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LEFT JOIN Question...
I have a fairly simple question... I have a 'users' table that holds member info and a 'usergroup' table that assigns a specific usergroup(s) (like advertiser, best avatar, etc) with a specific user. For instance, most users do not have a record in the 'usergroup' table, but those who are members of a usergroup, have a record in the'usergroup' table. Sometimes they have more than one, if they are a member of more than one usergroup.

I have a forum-like application that outputs posts made by users and I want to also retrieve each users usergroup information (if they have some) with this query. The problem I am running into is that it is only returning one usergroup record if more than one usergroup record is present for a user. So if a user has say 5 usergroup records in the 'usergroup' table, I would like to have all 5 records within the data set so I can use it in my application. By using the LEFT JOINS below, it is only returning one of the records.

Is there a way to return all the records in the 'usergroup' table that belong to the specific user the while loop is on (mysql_fetch) in some sort of array or something? Thanks for your help!

PHP

SELECT `u`.*, `ug`.*, `p`.* FROM `users` AS `u` LEFT JOIN `usergroup` AS `ug` ON (`u`.`usergroupid`=`ug`.`usergroupid`) LEFT JOIN `posts` AS `p` ON (`u`.`userid`=`p`.`userid`);

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LEFT JOIN Update
I am trying to update my ranking table with reference to its parent table 'tut_db'. The following query only updates ranking table row if a row already exists in ranking table with its parent id.

PHP

UPDATE tut_db LEFT JOIN ranking
    ON (tut_db.id=ranking.tut_id)
    SET
    ranking.uvote=ranking.uvote+1, ranking.votes=ranking.votes+1
    WHERE tut_db.id=$id

I also tried the following:

PHP

UPDATE ranking
    SET
    uvote=uvote+1, votes=votes+1
    WHERE tut_id=$id

If a row exist with tut_id it update. Is I need to check first that if tut_id=id exist then update else INSERT?

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