Unique, foreign key, NOT NULL and check constraints that rejected a row.
23505
duplicate key value violates unique constraintA value already exists in a primary key, unique constraint or unique index, often because a sequence is behind the data.
23503
insert or update on table violates foreign key constraintA row points at a missing parent row, or a parent row that is still referenced would be deleted or changed.
23502
null value in column violates not-null constraintA row would store NULL in a NOT NULL or primary key column.
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