Sunday, 26 January 2014

What are cascading triggers?

A Trigger that contains statements which cause invoking of other Triggers are known as cascading triggers. Here’s the order of execution of statements in case of cascading triggers:
  • Execute all BEFORE statement triggers that apply to the current statement.
  • Loop for each row affected statement.
  • Execute all BEFORE row triggers that apply to the current statement in the loop.
  • Lock and change row, perform integrity constraints check; release lock.
  • Execute all AFTER row triggers that apply to the current statement.
  • Execute all AFTER statement triggers that apply to the current statement.

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