己彦红 2021-08-17 04:31 一个已经开发者_如何转开发考上的政法干警回答你，我正愁怎么辞职呢！
So I have a booking system where I have a \'lesson_type\' table with \'lesson_type_id\' as开发者_如何学编程 PK. I have a constraint in place here so I can\'t delete a lesson_type if there are bookings
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