Duplicate keys, NOT NULL columns, and foreign key and CHECK constraint violations.
1062
Duplicate entry for keyA value already exists in a PRIMARY KEY or UNIQUE index.
1452
Cannot add or update a child row: a foreign key constraint failsA child row points at a parent row that does not exist.
1451
Cannot delete or update a parent row: a foreign key constraint failsA parent row that child rows still reference is being deleted or its key changed.
1048
Column cannot be nullNULL was sent for a column declared NOT NULL.
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