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If trigger is BEFORE I guess trigger will run before the check constraint.

But what is the order if trigger is AFTER? Does the check run first?

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    before triggers -> non-deffered constraints -> after triggers (if constraints passed) Commented Jul 6, 2021 at 16:15

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Don't guess, know Create Trigger:

The trigger can be specified to fire before the operation is attempted on a row (before constraints are checked and the INSERT, UPDATE, or DELETE is attempted); or after the operation has completed (after constraints are checked and the INSERT, UPDATE, or DELETE has completed); ...

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