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How to create trigger to delete from table after delete?
When they choose to remove a patron, the patron is removed from the table 1 patrons. At this point, nothing happens to table 2 patron_info. I’m simply trying to create a trigger to delete from table 2, when table 1 has an item deleted. Here’s what I’ve tried… Initially, I try to drop the trigger if it exists (just to clear the air)…
How to delete patron ID in MySQL trigger?
As you want to delete all rows with the deleted patron ID, you have to use old.id (Otherwise it would delete other IDs) Dont forget the “;” on the delete query. Also if you are entering the TRIGGER code in the console window, make use of the delimiters also.
What happens when I delete a table in MySQL?
The administrator can manage the patrons. When they choose to remove a patron, the patron is removed from the table 1 patrons. At this point, nothing happens to table 2 patron_info. I’m simply trying to create a trigger to delete from table 2, when table 1 has an item deleted. Here’s what I’ve tried…
How does trigger work in mysql table structure?
When a new patron is created, they have some information about them stored into a 2nd table (This was done using a trigger as well, it works as expected). Here’s an example of my table structure and relationship. The administrator can manage the patrons. When they choose to remove a patron, the patron is removed from the table 1 patrons.
How to override SQL Server trigger for deletes?
Be aware that it will rollback the whole transaction in case yuo’re deleting multiple rows among which at least one is “Peter”. 2) You override the way SQL Server does DELETEs on the table, using an INSTEAD OF trigger. In this case, you silently ignore DELETEs for the row “Peter”.
How to create trigger sampletrigger in SQL Server?
Suggestions? CREATE TRIGGER sampleTrigger ON database1.dbo.table1 FOR DELETE AS IF EXISTS (SELECT foo FROM database2.dbo.table2 WHERE id = deleted.id AND bar = 4) — If there is a row that exists in database2.dbo.table2 — matching the id of the deleted row and bar=4, delete — it as well. — DELETE STATEMENT?