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Top Forums Programming MYSQL - trigger update on record insert or update Post 302888668 by barrydocks on Sunday 16th of February 2014 04:52:24 PM
Old 02-16-2014
MYSQL - trigger update on record insert or update

Right I have a MYSQL database with table1 with 3 columns, colA, colB and colC. I want to combine the data in the 3 columns into a 4th column names col_comb. Here's the SQL command that works:
Code:
UPDATE table1 SET `col_comb` = CONCAT( `colA` , ' - ', `colB` , ', ', `colC` );

So now I want this to happen automaitically if a record is either inerted or updated in table1. I have tried setting up a trigger but it is not possible to use UPDATE in a trigger, here's an example:
php - MySql Error: Can't update table in stored function/trigger because it is already used by statement which invoked this stored function/trigger - Stack Overflow

Any suggestions on how to achieve this?

Thanks
 

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DROP 
TRIGGER(7) SQL Commands DROP TRIGGER(7) NAME
DROP TRIGGER - remove a trigger SYNOPSIS
DROP TRIGGER name ON table [ CASCADE | RESTRICT ] INPUTS name The name of an existing trigger. table The name (optionally schema-qualified) of a table. CASCADE Automatically drop objects that depend on the trigger. RESTRICT Refuse to drop the trigger if there are any dependent objects. This is the default. OUTPUTS DROP TRIGGER The message returned if the trigger is successfully dropped. ERROR: DropTrigger: there is no trigger name on relation "table" This message occurs if the trigger specified does not exist. DESCRIPTION
DROP TRIGGER will remove an existing trigger definition. To execute this command the current user must be the owner of the table for which the trigger is defined. EXAMPLES
Destroy the if_dist_exists trigger on table films: DROP TRIGGER if_dist_exists ON films; COMPATIBILITY
SQL92 There is no DROP TRIGGER statement in SQL92. SQL99 The DROP TRIGGER statement in PostgreSQL is incompatible with SQL99. In SQL99, trigger names are not local to tables, so the command is simply DROP TRIGGER name. SEE ALSO
CREATE TRIGGER [create_trigger(7)] SQL - Language Statements 2002-11-22 DROP TRIGGER(7)
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