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Mutating table errors

A MySQL expert describes how mutating table errors are can be triggered by foreign keys.

What are mutating table errors?

Mutating table errors occur when a trigger attempts to access a "mutating" table, like the table from which the trigger has been called. In MySQL, triggers are not initiated by cascading foreign keys, and they cannot modify the table from which they are called, so neither of those issues can cause a mutating table error. However, foreign keys appear to operate before 'AFTER' triggers, so it is possible to create a trigger that will cause a statement to fail.

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