Table triggers vs. row triggers
What are the differences between statement triggers and row triggers?

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Statement triggers "fire" once for each statement no matter how many rows that statement affects. Row triggers act for each row affected. A statement like "UPDATE myTable SET myField = 1" would fire a statement trigger only once. That same statement would cause a row trigger to fire as many times as there are rows in the table. MySQL currently only supports row triggers.

This was first published in December 2006

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