UNIQUE, PRIMARY KEY, NOT NULL, CHECK and FOREIGN KEY constraints that rejected a row.
CONSTRAINT
UNIQUE constraint failedA value already exists in a UNIQUE or PRIMARY KEY column (both use this message).
CONSTRAINT
FOREIGN KEY constraint failedA child row has no parent, or a parent still has children; find it with foreign_key_list and foreign_key_check.
CONSTRAINT
NOT NULL constraint failedAn INSERT or UPDATE would store NULL in a NOT NULL column; a DEFAULT does not apply to an explicit NULL.
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