how to use trigger and when to use for auto updation?

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I am using phpmyadmin.I have a table 'product' with 3 attributes-name|price|date.I need to reset the price to 0 when date < current date(cur_date).I tried using an update query to do the same in my php page which worked,but got other websites too connected to the same db, therefore same update statement has to be written in all of these pages.I would prefer a single step solution for the same which can be done by using trigger but im unaware of how to use it.Could someone pls help me with the query for the same and mention where am i to use the trigger statement in php part or phpmyadmin?

Posted 20-Jan-16 18:19pm

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PIEBALDconsult 21-Jan-16 0:33am

Never use triggers.

Sinisa Hajnal 21-Jan-16 5:52am

Create stored procedure that does what you need to do and call it from scheduled job on the database.

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W∴ Balboos, *GHB* · Answer 1 · 2016-01-22T02:24:00

You may wish to re-examine what triggers do: CREATE TRIGGER (Transact-SQL)[^]

Therefore, based upon what you wish to do a trigger is not the correct tool. As per the suggestion, above, you really need a job that runs nightly

Some alternatives (not best practices!):

Computed Column With Conditionals

You may wish to define a function and retrieve the value with the function so that it returns 0 when the value expires.