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Hence explicitly specifying FOR EACH ROW is optional.
FOR EACH ROW implies that the SQL statements specified in the trigger may be executed (depending on the WHEN clause) for each database row being inserted, updated or deleted by the statement causing the trigger to fire.
3 I then call a procedure that generates a block_id for each row, I use a table to store this block_id. 4 But the problem is that I want to update the unload_details_tab with the values from temptable.
The after update trigger generates a self-deadlock error.
The order of the execution of these triggers is undeterministic (or random, if you want this word) except that all before triggers fire before the after triggers.
In my The Wonderful (and not so Wonderful) Things about My SQL Triggers article, we saw how triggers can be useful in some contexts, and yet inferior to stored procedures in others.
With non-transactional storage engines, if a BEFORE statement produces an error, the statement will not be executed.
Both the WHEN clause and the trigger actions may access elements of the row being inserted, deleted or updated using references of the form "NEW.column-name" and "OLD.column-name", where column-name is the name of a column from the table that the trigger is associated with.
OLD and NEW references may only be used in triggers on events for which they are relevant, as follows: If a WHEN clause is supplied, the SQL statements specified are only executed if the WHEN clause is true.
If no WHEN clause is supplied, the SQL statements are executed every time the trigger fires.
The BEFORE or AFTER keyword determines when the trigger actions will be executed relative to the insertion, modification or removal of the associated row.