MYSQL :: Outer Join Count Query

Slow Execution For A Left Outer Join Query
Whats likely to be the cause of slow execution for a left outer join query?

The original query joins three tables but even if I narrow it down to one it still takes a long time to execute.

$query = "select distinct materials.* from materials";
$query .= " left outer join materials_products on materials.material_id = materials_products.material_id";

There's 914 rows in the materials table and 1348 row in the materials_products table

Is it likely to take a long time for this amount of data or is there likely to be a problem in the table(s) set up or query?

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Cross Join + Full Outer Join ?
I desesperately need to cross join 2 rows in a table, like this table :

table values :
env type value
---------------------
env1 a 1
env1 b 2
env2 b 3
env2 c 4
env3 c 5

-> to get another table crossed by env and type like this :

table results :
a b c
----------------------
env1 1 2 null
env2 null 3 4
env3 null null 5

i tried requests using cross join and full outer join but no way, FULL OUTER JOIN is unknow by mysql, indeed i doubt this is the good solution...

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Do I Need An Outer Join?
I have a table that stores traffic data keyed on a char (even though I call it a tstamp). The data is coalated into hourly chunks and is viewed through a web app in monthly, daily and hourly increments.

I've been charged with creating some KPI's (Key Performance Indicators) from this data and one of them is for a given month/day/year, generate an addition figure of how many times the average traffic per period (in a column called average) is less than or equal to 5.

mysql> desc coal_counts ....

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Outer Join With Where
I am willing to select all the distinct Products from the product table and in case the PC Name was the same as a @ passed PC name return ALSO the local path, Otherwise return null for the localpath field.... How I can do that?
here is my query:

SQL
SELECT Products.Name, Products.Code,
UserProduct.LocalPath, UserProduct.PC FROM
Products LEFT OUTER JOIN
UserProduct ON
UserProduct.ProdCode = Products.Code
this returns the same product name and product code from many users....also, I want to return distinct Product Names also.

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A Simple Outer Join
Sorry to post a naive question , But i need a query for this simple condition.
There are 2 tables employee and email . both have employee id as PK. I need to list employee names and emails . If enrty does not exist in email ..then it should get NULL .
Select employee.name, email.id from employee , email where ?

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Full Outer Join
I have a main table called property, and a lookup table called ptype (property type). the propertry table has a "type" field, and a "subtype" field. both these fields look at the ptype table to get their titles.
So, i currently have the query below, but i also want to add to this the subtype. trouble is the field name is going to be the same for both the type and subtype values, so how do i get at them both?

I tried "AS subtype" after the LEFT OUTER JOIN but this didnt work.

SELECT * FROM property
LEFT OUTER JOIN ptype ON ptype.pty_id = property.pro_ptype
WHERE property.pro_id = 1

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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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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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Iso FULL OUTER JOIN
I need to do a full outer join, but have not seen this available in the fine manual. Is this type of join available?

The task is to list everyone that has departed the company in a certain date range. Sometimes a record is entered on table A, sometimes on table B, sometimes on both.

SELECT a.NAME, b.NAME FROM TABLEA A FULL OUTER JOIN TABLEB B ON A.SSN = B.SSN WHERE A.DEPART_DATE BETWEEN @BEGIN AND @END or
B.DEPART_DATE BETWEEN @BEGIN AND @END .

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Outer Join 3 Tables
I am trying to join 3 tables:
t1 and t2 have an inner join at t1.t1_t2 = t2.t1_t2
t1 and t3 have a left outer join at t1.t1_t3 = t3.t1_t3

For some reason, the synatx is not working for me.

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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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Three Table Outer Join
I have three tables:

items (id, article, etc)
deliveries (id, shipment_date, etc)
movements (item_id, delivery_id, quantity, etc)

I want to get result as following:
article | sum(quantity)

but for all articles (outer join) with condition for deliveries table(shipment_date >= '2004-08-01' for example)

It works for two table join (items and movements) without deliveries:
select i.id, sum(m.quantity) from
items i left outer join movements m on m.item_id = i.id

but how I should join "deliveries" table to add condition for shipment_date ?

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Outer Join And Distinct
I just started building a website and use MySQL as my backend database. I'm having a little trouble creating an SQL query that will get the correct information out.

Here's my problem:

I have 3 tables:
people: stores the name of people who can vote
votetype: stores the type of votes there are (In favor, Against, Withheld)
decisions: the dicisions that were voted on

Then I have another table that links them all together called votes. Votes has three columns: personID, typeID and decisionID. personID and decisionID are primary key. All are foreign key to obvious tables.

I want to retrieve for a given person the votes he made for all decisions. So: a list of all decisions with the vote he or she made and a NULL if there is no vote.

So far I have this query:
SELECT DISTINCT d.ID, d.name, d.date, v.typeID AS vID, t.name FROM decisions d, votetype t LEFT OUTER JOIN votes v ON v.decisionID = d.ID WHERE (v.personID=1 OR v.personID IS NULL) AND (v.typeID=t.ID OR v.typeID IS NULL) ORDER BY d.date;

For some reason the DISTINCT doesn't work and I get a decision that is not voted for three times (once for each type while v.typeID column is NULL).

How can I fix this so each decision only shows up once?

Jurgen

-------------------------
I've found a solution:

SELECT DISTINCT d.ID, d.name, d.date, v.typeID AS vID, IF(v.typeID IS NULL,NULL,t.name) AS stem FROM decision d, votetype t LEFT OUTER JOIN votes v ON v.decisionID = d.ID WHERE (v.personID=1 OR v.personID IS NULL) AND (v.typeID=t.ID OR v.typeID IS NULL) ORDER BY d.date;

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Transform SubSelect In OUTER JOIN
maybe I'm simply to dump but I could not transform this SQL-Statment
which uses a Sub-select and create on that uses an OUTER JOIN ....

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Left Outer Join Produces
In order to eliminate duplicate values from the right of a query I tried the following:

LEFT OUTER JOIN
        `private_comments`
    ON
        `report_cards`.id IN (select distinct `private_comments`.student_id1 from `private_comments`)

I have unique `report_cards`.id but multiples of `private_comments`.student_id1.

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Full Outer Join Should Work
why doesn't the following work?

mysql> select * from girls full outer join boys where girls.city = boys.city;

where :

drop table girls;
drop table boys;
create table girls (name varchar(12), city varchar(12));
create table boys (name varchar(12), city varchar(12));
insert into girls values('Mary', 'Boston');
insert into girls values('Nancy', null);
insert into girls values('Susan', 'Chicago');
insert into girls values('Betty', 'Chicago');
insert into girls values('Anne', 'Denver');
insert into boys values('John', 'Boston');
insert into boys values('Henry', 'Boston');
insert into boys values('George', null);
insert into boys values('Sam', 'Chicago');
insert into boys values('James', 'Dallas');

If needed, I can go into insert and create for you!

BTW left and right work OK!

BTW what do P1(T1,T2), P1(T1,T2) and R( mean in the following

SELECT * T1 LEFT JOIN T2 ON P1(T1,T2)
WHERE P(T1,T2) AND R(T2)

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Double OUTER JOIN On The Same Table?
I'm trying to make a request with an OUTER JOIN on 2 fields at the same time:

Here are the tables:

test:
- id
- user1
- user2

users:
- id
- username

And Id like to get as result each line of the 'test' table, with the corresponding username from 'user' fir the fields user1 and user2.

Do you know how to do this without using several SELECT?

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LEFT OUTER JOIN WITH INNER JOINS
I am a bit stuck on a LEFT OUTER JOIN. I can get the query to run OK when leaving needed data out of the query (other inner joins). Basically, this is an booking system for a tour company. Some people arrive by cruise ship while others do not. I need this query to gather the customer Booking info from multiple tables and the cruise ship information for those bookings that arrive by ship and return a null ship name for those that dont.

Each ship has a name and a scheduled arrival date. the shipSchedule table holds the data for the scheduled dates and references the ship name from another table(because the same ship comes into town on multiple dates). To eliminate blank entries in the booking table (for those customers not on a ship) there is another table that stores the shipSchedule_ID and the Booking_ID for Bookings that arrive by ship. So, this query needs to get "shipName" from "cruiseShips" then reference the "shipSchedule" table to get the "shipSchedule_ID" then reference the "shipSchedule_ID" in the "ArriveByShip" table to reference "ArriveByShip.Booking_ID" to "Bookings.Booking_ID" field on order to correctly display the ship name the person comes in on for their Booking (possible to have more than one booking)..

The query (this works....but is incomplete) ....

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Left Outer Join Syntax
I am trying to join a table to three other tables

Table 1 has all records
Table 2-4 must be left outer joined to table 1, not in a chain

using "other" dbs ...

select t1.a
,t2.b
,t3.c
,t4.d

from t1
,t2
,t3
,t4

Where t1.id = t2.id (+) and t1.id = t3.id (+) and t1.id = t4.id (+)

I've tried using the left outer join syntax ...

select t1.a
,t2.b
,t3.c
,t4.d

From t1
LEFT OUTER JOIN t2 using (id)
LEFT OUTER JOIN t3 using (id)
LEFT OUTER JOIN t4 using (id)

but that, of course chains t1 to t2, t2 to t3, and t3 to t4.

How can I make this join work, without the use of subqueries?

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Struggling With Left Outer Join
got two tables:

T1 - User, Date, Stuff

T2 - User, Date, Other Stuff

I want to be able to select rows from T1 based on User & Date, join those rows to the data in T2, so T1.User=T2.User AND T1.Date=T2.Date. Then I want to sort the results in T1.Date order

I've no idea where to start ... anyone point me in the right direction?

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Multiple LEFT OUTER JOIN
What is the right way to do a LEFT OUTER JOIN on both these tables to the 'Main' table where WHERE Plan.pID IS NULL and Record.rID IS NULL (primary's)

Plan
pID | _mn (foreign main key) | pType

Record
rID | _mn (foreign main key) | rDate

Main
mID (primary) | mComp

-------------------------------------
Will need: pType, rDate, mComp values as a result of the query.

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OUTER JOIN With Extra Conditions?
I need to get a list of products in a certain category, along with the quantity of each item already added to the shopping cart for a given session number. I'm having a heck of a time satisfying the latter condition.

shoppingCart table:
+--------+-----------+-----------+-----+
| cartID | sessionID | productID | qty |
+--------+-----------+-----------+-----+
product table:
+-----------+--------------+------+--------+
| ProductID | ProductCatID | name | Active |
+-----------+--------------+------+--------+
Here's my base query, which just gets all the products in a given category.

SELECT product.*
FROM product
WHERE `ProductCatID`='{$id}'
AND `Active`=Ƈ'
Here's the query I've got so far:

SELECT product.*, shoppingCart.qty
FROM product
LEFT OUTER JOIN shoppingCart ON shoppingCart.productID = product.ProductID
WHERE `ProductCatID` = Ɗ'
AND shoppingCart.sessionID = '{$sessionID}'
AND `Active` = Ƈ'
Obviously, this does NOT work, because it limits the query to ONLY products that have the specified sessionID. I need it to return ALL the products in the category, but give me the quanity for items in the shoppingCart table, ONLY IF the sessionID matches (otherwise it should return NULL)!

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Outer Join Syntax Error
Trying to do an outer join to retrieve info from two data bases and keep coming up with syntax errors....here's the code

$result = @mysql_query('SELECT * FROM members OUTER JOIN 2nd_location USING (members.ID = 2nd_location.ID) WHERE members.type= "RET" AND members.active="A" AND members.multi_location="Y" ');

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Left Outer Join, Upgrade To Mysql 5.0.12
I have the following sql that used to work in an older version of mysql:

SELECT place.* , part.id, part.lastName, part.firstName, part.ssn, exit.*
FROM placements place
LEFT OUTER JOIN participants part ON part.id = place.participant_id
LEFT OUTER JOIN exit ON exit.id = place.exit_id

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Left Outer Join Doing Wired Things
i have two tables, tableA and tableB, i want all of tableA but regardless of if there is a record in tableB that references the record of tableA, so thats what an outer (or left, or left outer) join should do if tableA is the left table... right?

Ok first my Query:

SELECT *
FROM tableA A
LEFT OUTER JOIN tableB B
ON A.ID=B._IDa
WHERE ((B._IDb IS NULL) OR (B._IDb=3)); -- no record exists in tableB with _IDb=3

tableA is referenced by tableB's foreign key field _IDa
tableA has 27 rows, tableB has many rows but none that have _IDb=3

So I expect to get 27 rows with NULL for all fields of tableB, but i only get 18 rows!!
(all fields of tableB are, as expected, NULL, but WHY those 18?!! why not all or none?!)

Note though that B is a composite entity, where _IDa is only half of the primary key, _IDb is the other half referencing someother table that's not important for this problem.

Code:

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Sould Someone Verify LEFT OUTER JOIN?
could someone please verify :

SELECT *
FROM Members, Submits, MNotify LEFT OUTER JOIN MemPay as mp on
(mp.MPMem_ID=Members.MemID and Members.MemID=colname and mp.MPSub_ID=MNotify.FK_SubmID)
WHERE Submits.SubmID=MNotify.FK_SubmID and Members.MemID=colname
MemPay - payment table, where
MPID | MPMem_ID (actually foreign) | MPSub_ID

Members
MemID

Submits - submitted ads
SubID

MNotify - Members become notified of individual submitted ads
MNID | FK_MemID | FK_SubmID

Members can view each MNotify.FK_SubmID (submitted ads -- the ads may be bought, and if so are found in MemPay table. MPMem_ID is the buyer primary id and MPSub_ID is the id of the submitted ad bought.)

In any case, the Member can view all submitted ads (including purchases) while the check on the LEFT OUTER JOIN values gives what he or she has bought.

While it seems to output as it should, when I check on the LEFT OUTER JOIN values with php conditional statements I've getting values oppositie of what they should (checking on NULL, <>NULL, empty, !empty)

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Left Outer Join And ORDER BY Question
This question is best understood when illustrated with an example:

SELECT dept_name AS dept,
TRIM(CONCAT(fname,' ',lname)) AS name,
title,
number,
comments
FROM emp
LEFT OUTER JOIN dept
ON dept.dept_id = emp.dept_id
WHERE 1=1
ORDER BY dept ASC,
emp_order ASC
Note that the last condition of the ORDER BY clause references a field that is not selected in this SELECT statement. This works perfectly in MySQL, but I'm wondering if this is consistent with standard SQL? And, whether it's standard SQL or not, is this considered good practice? I have no use for emp_order except for determining the order of rows returned, so it just doesn't make sense to SELECT it, but at the same time it seems odd to reference a field I'm not SELECTing.

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Is Left Join And Left Outer Join Are Equal?
I just want to inquire that In Mysql,

Is left join and left outer join are equal.

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Alias To Outer Query In Subquery
I have been using a query on MySQL 5.0.51a and it has been fine. Today my host has upgraded to 5.0.67 and now the query no longer works. I have had a quick look over the changelog and it looks like MySQL should not have allowed an alias in the subquery to reference the outer query in the first place.

So now I am stuck in finding a solution to re-writing the query without needing the alias. The query will get the current weeks game fixtures and check to see if the user has any predictions left to add for that week.

If you need to see the structure of my tables, just let me know!

SQL Code:....

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Trying To Get Total Count Plus Count From WHERE Clause In One Query
I am fairly familiar with mysql, have been using it with php for about a year now for my development work. One query I am stuck on is the following. I am doing reporting, and need to find the count from a WHERE clause compared to the total count for that group. For the sake of an example, let's say I have a prize table that contains a complete list of prizes. There is a column to list if the prize has been won or not (prizeUsed - Y or N) and another that has the prize name (prizeName - string). I want the final result to list something like:

Total Prizes ____________________ 100 of 850 ......

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Java Code Or Pseudo Code For "Outer Join"
I want to implement the "outer join" functionality in Java. Can
somebody explain the pseudo code for the same. OR what needs to be done
to extend the hash-join Java code of equijoin.

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COUNT With JOIN
How can I combine these two quries into one query? These queries both work - so there is no problem with getting data from the database.

I would simply like to combine this into one query with out doing a sub-query.
When I try to combine it, I must use a GROUP and this effort is something I can not do and retain the results to be correct.

SELECT DISTINCT A.EX_ID,B.TITLE,B.SUMARY
FROM EX_KEYWORD AS A
LEFT JOIN EX_EXAMPLE AS B ON A.EX_ID=B.EX_ID
WHERE A.KEYWORD LIKE '%something%'
ORDER BY A.EX_ID DESC
LIMIT 45,10

SELECT COUNT(DISTINCT EX_ID) AS count FROM EX_KEYWORD WHERE KEYWORD LIKE '%something%'

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Using MAX() And COUNT() With Join
I'm a bit unclear on joins still and would like to figure out a way to merge two queries into one, if it's possible. I'm wondering how to use the function count() and max() in the same query. I can currently do the queries seperately like this:

A) The first is a frequency count which shows the frequency count() of each value of the column dc_subject:

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Count With Inner Join
I have 2 tables that I need to Inner Join and then count how many duplicates of a record I have. Here is the set up:

Table 1
Username / Post
------------------
user1 / POST1
user1 / POST2
user4 / POST3
user5 / POST4
user4 / POST5

Table 2
Username / Reply
------------------
user2 / REPLY1
user2 / REPLY2
user3 / REPLY3
user1 / REPLY4
user1 / REPLY5

I am trying to count how many posts and replies each username has. Such as:

user1 = 4
user2 = 2
user3 = 1
etc...

I am stuck on this. I have researched using google and such, found some example, but cant seem to get them implemented correctly. Here is was I have so far, but it is coming out totally wrong. There are at least 3 usernames listed between the 2 tables and it is only displaying 1 with a wrong count. What am I doing wrong? Code:

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Use Count And Join At The Same Time
How to use count and join in the same time?

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Left Join With Count
I'm just getting a big mental block when trying to write this query.

DB SCHEMA

SUPPLIERS
supplierID, name, website

PRODUCTS
code, supplierID, name, photo
Products belong to suppliers, supplier may have none, one or many products. (1:M)

I need a query to produce ALL suppliers, and a count of products where the photo field is empty (it's varchar).
I can do the LEFT JOIN to list all suppliers and a product, but I don't know how to do the count WHERE p.photo = ''

Each supplier should appear exactly once in the result set.

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For Efficiency: Increment Count Or JOIN?
Question of efficiency:

I have a table named 'articles' which is listings of written articles or stories, and a 'comments' table which hold all the comments posted for the articles. I want to have PHP pages showing articles sorted by most commented in descending order.

Should I have a comment_count field in the 'articles' table which increments +1 each time a comment is posted for a particular article (requiring UPDATE and INSERT query each time a comment is posted), OR should I do some sort of JOIN or UNION of the two tables?

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How To Join Two COUNT Results From Two Tables
I have an email campagin system while sending each mails i am recording it with current timestamp

sample data ....

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LEFT JOIN And COUNT When There Is A WHERE Clause
I have two tables
categories
id category_name
1 books
2 movies

items
id category_id item_name in_stock
1 1 da vinci code 1
1 1 blink 1
1 2 changeling 0

I want a query that returns the total number of books and movies that are in stock (stock = 1).

so I would like the query to return
c.id c.category_name cnt
1 books 2
2 movies 0

The query:
SELECT c.id, c.category_name, count(i.id) AS cnt FROM categories AS c LEFT JOIN items as i ON (c.id = i.category_id) WHERE in_stock > 0 GROUP BY c.id;
doesn't return the category 'movies'.
it returns:
c.id c.category_name cnt
1 books 2

How do I modify the query so that it returns rows with a count of zero?

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Join Tables To Count Number Of Records?
I've two tables:

responses
==========
response_id
schema_id
timestamp

answers
==========
answer_id
response_id
answer

(that's a cut down version, but will do for this question)

I need to get all the responses where there is at least one answer in the answers table. But I do not want the answer data. It's literally a quick check for an export to say "get me all the responses where there's at least one question answered". I have this: Code:

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Problem With Left Join And Count, Returning More Rows Than What It Should
Am having a problem with a query, strangely ...

PHP

SELECT *
FROM table1 AS mt
LEFT JOIN table2 AS pt ON mt.p_id = pt.p_id
WHERE my_field = 'somevalue'

Is returning a much bigger number (12 rows) for me, then what it should.

PHP

SELECT *
FROM table2
WHERE my_field = 'somevalue'

Is returning only 2 rows

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Trying To Pull Id, Count And Title But Lose Rows When I Add Extra Join
i'm trying to extract some information from my database, the query being

PHP

SELECT grps_c.catid, grps_c.title, COUNT(grps.groupid) AS COUNT
            FROM grps
            RIGHT JOIN grps_category grps_c ON (grps_c.catid = grps.catid)
            GROUP BY grps_c.catid
            ORDER BY grps_c.title

which works fine. however some of the groups (grps.groupid) are hidden and i don't want to count them, so my thinking was add

PHP

LEFT JOIN grps_setting grps_s ON (grps_s.groupid = grps.groupid AND grps_s.hidden_group != Ƈ')

however adding that removes the rows that have a 'count' or NULL or Zero.

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Query Count
I've seen on some sites that there is a way to total up the number of queries ran on a page, and the time it took to run them - as per the bottom of this page:
Is this something which can only be done using PHP, or could I achieve the same result using ASP, by accessing something within MySQL?The reason I ask is that I have a site running MySQL on a Windows server, running IIS and ASP, and would like to set something up like the above.

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