Here is a simple example that associates a trigger with a table, to activate for INSERT operations. The trigger acts as an accumulator, summing the values.
I think you mean to update it back to the OLD password, when the NEW one is not supplied. DROP TRIGGER IF EXISTS upd_user; DELIMITER.
I assume you will value TableB first as it contains the order_no. In that case you need to use an update statement in your trigger instead of an.
According to the manual: Within the trigger body, the OLD and NEW keywords enable you to access columns in the rows affected by a trigger.
I have MYSQL table with following structure. id, username, enabled, qtused. & Trigger on another table RADACCT which trigger on update.
The MySQL trigger is a database object that is associated with a table. It will be activated when a defined action is executed for the table. The trigger c.
INSERT: The trigger is activated whenever a new row is inserted into the table; . The DEFINER clause specifies the MySQL account to be used when checking .
INSERT: The trigger is activated whenever a new row is inserted into the table; Before MySQL , triggers cannot contain direct references to tables by name . The DEFINER clause specifies the MySQL account to be used when.
DEFINER clause: The DEFINER clause specifies the MySQL account to be used when checking access privileges at trigger activation time.