Comments on: How to select from an update target in MySQL

By: Sam

Sam — Tue, 11 Oct 2011 13:30:53 +0000

Thanks mate, worked just fine

By: Craig

Craig — Wed, 28 Sep 2011 05:12:09 +0000

You need to make the inner select a temporary table (just wrap the select in another select).

Here is a good example.

http://www.toofishes.net/blog/agony-simple-things-mysql/

Annoying and painful, but that’s mysql..

Postgres would run the same sql as oracle with no problems, it’s a much better enterprise DB in my opinion.

By: Maglebolia

Maglebolia — Tue, 27 Sep 2011 14:26:23 +0000

Hello there, I’ve created my command for oracle and now I need it for mysql. Actually I have no clue of how to do this with one update command (will be a trigger afterwords). Here is my oracle command. I would appreciate if anyone can convert this to mysql.

UPDATE animal_table
SET (animal_info1,
animal_info2,
animal_info3) = (SELECT animal_nbr, animal_amount, ’00′
FROM animal_table t2
WHERE t2.category_id = animal_table.category_id
AND t2.sumary_id = animal_table.summary_id
AND t2.animal_type = ‘special’
)
WHERE animal_type = ‘cats’
AND category_id = ‘foo’

By: javaspc

javaspc — Wed, 15 Jun 2011 22:05:16 +0000

hey men muchas gracias

By: JESUS

JESUS — Wed, 15 Jun 2011 19:19:21 +0000

Hi, I know your are going to help me out, this is the structure of the table, I need to update (ocupado, blouqeado and tamano to ’0′) from file_name AA010202 to AA010106 with the script I have it gives me an error, what can i do….????

file_id | file_name |ocupado |bloqueado |tamano
3 | AA010102 | 1 | 1 | 40
4 | AA010104 | 1 | 1 | 40
5 | AA010106 | 0 | 1 | 0
6 | AA010108 | 0 | 1 | 0
7 | AA010110 | 0 | 1 | 0
8 | AA010202 | 1 | 1 | 40
9 | AA010204 | 0 | 0 | 0

UPDATE posiciones
SET
ocupado = ’0′,
bloqueado = ’0′,
tamano = ’0′
WHERE file_name =
(
SELECT MAX(file_name)
FROM posiciones
WHERE bloqueado > ’0′
)
AND file_name =
(
SELECT MAX(file_name)
FROM posiciones
WHERE bloqueado > ’0′
AND ocupado = ’1′
AND file_name !=
(
SELECT MAX(file_name)
FROM posiciones
WHERE bloqueado > ’0′
)
)

by the way THANK YOU a lot just for rading …!