MYSQL :: Multiple Left Outer Join Results Duplicates

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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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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Left Outer Join Query
I have noticed when I do a Left Outer Join in short form that many rows become missing as result of null values.
i.e Left Outer Join (t1,t2,t3) ON (....)
T3 being table with null values in
It seems to be all to hard when I log a bug.

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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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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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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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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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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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NOT IN And Left Join Should Give The Same Results In The Example, But They Don't . Why?
Just against me getting insane: I want to list all categories for which there exist no items.

I thought the following would give the exact same result, but it doens't. The join gives results while the NOT IN gives 0 results. How come?

select cats.id from cats left join items on cats.id = items.catid where items.id is null

select cats.id from cats where cats.id not in (select catid from items)

btw: what query is the most performant if any? or do you need more info for that?

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Left Join Multiple Columns
I am having problems LEFT joining Muti - columns to ONE table

This is what I am using:

SELECT *
FROM nanny_tbl left join position_tbl on nanny_tbl.position_pos=position_tbl.recid_pos and nanny_tbl.position2_nan=position_tbl.recid_pos
WHERE recid_nan = colname

The first left join woks 100%
the 2nd does not

nanny_tbl stucture is:

recid_pos --- this is primary key
position_pos ---- this is VarChar

Who can help me solve this?

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Left Join Multiple Tables
I want to join more than one table using left join. I have a table that stores shop profile where id field is primary key. This id field is foriegn key in orders, products and customers table. Now i want to show a listing in one query. I tried following query, but its giving incorrect results.

Select
s.id, s.title, count(p.id), count(o.id), count(c.id)
FROM
shop as s
LEFT Join
products p on s.id = p.shop_id
LEFT JOIN
orders o on s.id = o.shop_id
LEFT Join
customer c on s.id = c.shop_id
Group by s.id

The results i want look like

ID Title Products Orders Customers
2 Test 5 4 3
4 Test2 2 0 0

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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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Join Results From Select Multiple Statment
how I can join results from multiple queries in one result without geting a prodict of the tables

ex:
table1_Col1, table1_Col2, table1_Col3...table2_Col1, table2_Col2, table2_Col3...table3_Col1, table3_Col2, table3_Col3...
table1_Col1, table1_Col2, table1_Col3...table2_Col1, table2_Col2, table2_Col3...table3_Col1, table3_Col2, table3_Col3...
, , ...table2_Col1, table2_Col2, table2_Col3...table3_Col1, table3_Col2, table3_Col3...
, , ... , , ...table3_Col1, table3_Col2, table3_Col3...
, , ... , , ...table3_Col1, table3_Col2, table3_Col3...

using the 4.0 sql so no subqueries supported.

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LEFT OUTER Is Faster Than INNER Joins?
Maybe someone can explain this to me real quick. I have two identical queries, except that the join type changed. One uses inner joins:

SELECT OrderItems.product_id AS product_id
, OrderItems.code AS product_code
FROM Orders
INNER
JOIN OrderItems
ON Orders.id = OrderItems.order_id
INNER
JOIN Products
ON OrderItems.product_id = Products.id
WHERE Orders.orderdate >= UNIX_TIMESTAMP(DATE_SUB(NOW(), INTERVAL 24 HOUR))
AND Products.active = 1
GROUP
BY OrderItems.product_id
and the other uses the basic LEFT OUTER JOIN:

SELECT OrderItems.product_id AS product_id
, OrderItems.code AS product_code
FROM Orders
LEFT OUTER
JOIN OrderItems
ON Orders.id = OrderItems.order_id
LEFT OUTER
JOIN Products
ON OrderItems.product_id = Products.id
WHERE Orders.orderdate >= UNIX_TIMESTAMP(DATE_SUB(NOW(), INTERVAL 24 HOUR))
AND Products.active = 1
GROUP
BY OrderItems.product_id
When I run the two queries on the same data (using phpmyadmin), the left outer joins only take 0.12-0.13 seconds whereas the inner joins take a whopping 2.5+ seconds. I kinda thought that an inner join would be faster. I'm still bad with determining join types.... Is there a fundamental reasoning for this that I am missing?

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Summing Two Columns From Two Left Outer Joins
I've got data from three tables. Two of them have a column that needs to be summed and displayed with the rows of the remaining table. So the raw joins of c3 and c4 from the two tables onto c1 and c2 from the third table look like this:

id c1 c2 c3 c4
1 A B 7 3
1 A B 7 8
1 A B 2 3
1 A B 2 8
And I want

id c1 c2 c3 c4
1 A B 9 11
The group by clause was working beautifully and I didn't have a problem until I threw another table into the mix (the data from c4). Now it's just summing up everything in c3 and c4 from the raw table... not particularly surprising but I'm not sure how to get around this problem

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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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Run Outer Join Query
I am trying to run following query in mysql.

select a.name, a.record, b.data from A a, B b where a.name*=b.name and b.date='2006-07-28'

How can I do this in mysql? I looked up LEFT JOIN but still can't figure it out.

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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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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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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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Outer Join Count Query
I want to create an outer join along with usage of group by & count...

So, I want the rows with count=0 to be part of the result...

Select a.area, count(l.id) as no_listing from area a left join listing l on a.area=l.area group by a.area order by a.area;

Note that an area can have multiple listings...

Now, this query returns me only the areas with some positive count of listings, in spite of using a left join...

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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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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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Duplicates On Multiple Fields
The table has fields:
home_id, owner, street_number, direction_one, street, street_type, city

I have a problem where the same address information was entered in but with different owners. How do I find all the duplicates? I tried this query:
SELECT home_id, street_number, street, city
FROM home_data
GROUP BY street
HAVING ( COUNT(street) > 1 )

but that only works for duplicates on street, at the very least it should check for dups on street_number and street and city. When I ran the above query it took forever. My table has over a million records in it. Basically my computer froze up but kept running and I kept getting virtual memory errors.

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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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Insert Multiple Fails Completely If Any Duplicates Exist
I've been having some problems with database performance... Several
threads are constantly attempting INSERTs of new records into a large
table - that is hundreds of thousands of records -large by my account
:-) The table has a VARCHAR field tagged as UNIQUE and inserts are
kind of slow. i'm relying on the INSERT to fail on duplicates, i'm
not performing any checking before i attempt the INSERT (i figured an
additional SELECT would slow things even more - but any advice to the
contrary would be appreciated).

While these back end threads are constantly banging away with their
INSERTS, front end users are hitting the DB with searches. so i end
up with several threads simultaneously attempting very expensive DB
operations. the result is that the front end that users see is
DREADFULLY slow.

My proposed speedup is to modify the behavior of the backend threads
so that they don't constantly attempt INSERTS of single entries, but
build up a hashtable of local entries and at some interval, attempt a
multiple insert something like:

INSERT INTO table (col1,col2,col3 VALUES (x1,y1,z1), (x2,y2,z2)....

While i do expect to take a big hit when these multiple inserts
launch, in the time between, i expect front end performance to be
significantly improved.

The problem with this situation is that the multiple insert may
contain one or more new entries which will cause duplicates on my
table's UNIQUE VARCHAR field. I would like to have duplicates ignored
on insert, but have all newly unique entries be added. Sadly, from
what i've seen, once a duplicate violation for any of the new entries
is found, the call fails, leaving my newly UNIQUE entries NOT ADDED.
Is there any way to get the call to work as i want? Doing many single
row inserts sounds like it'll be much slower (judging from what i've
read) so i'd rather not resort to that.

I don't have a ton of DB experience (which may be obvious) so if i've
overlooked something simple please let me know. If there's a better
way to improve performance other than these multiple inserts, that
would be nice to know about too. Thanks for any insight,suggestions,
etc...

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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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Join Vs. Inner Join Vs. Implied Join = Different Results ??
I SUM() only on the order table in all queries below. Here's a set of queries that I thought would/should yield the exact same results:

QUERY 1:
SELECT COUNT( o.orderID )
FROM order o
WHERE DATE( o.orderDATE ) = &#55614;&#57159;-01-04'
AND o.orderSTATUS = 300

yields 161

QUERY 2:
SELECT COUNT( o.orderID )
FROM order o
LEFT OUTER JOIN credit_card cc ON o.orderID = cc.orderID
WHERE DATE( o.orderDATE ) = &#55614;&#57159;-01-04'
AND o.orderSTATUS = 300

yields 175

QUERY 3:
SELECT COUNT( o.orderID )
FROM order o, credit_card cc
WHERE o.orderID = cc.orderID
AND DATE( o.orderDATE ) = &#55614;&#57159;-01-04'
AND o.orderSTATUS = 300

yields 157

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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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