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What is the usuage of an ON-INSERT,ON-DELETE and ON-UPDATE

What is the usuage of an ON-INSERT,ON-DELETE and ON-UPDATE TRIGGERS ?..

Answer / guest

These triggers are executes when inserting,deleting and
updating operations are performed and can be used to
change the default function of insert,delete or update

For Eg, instead of inserting a row in a table an
existing row can be updated in the same table.

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