PostgreSQL:Constraints
제약조건
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When you create the table you can do something of this sort,
(namechk
is just a name for the constraint)
Same goes for ALTER TABLE
for example:
Check Constraints
on delete cascade
- MySQL :: foreign key 사용하기, on update cascade, on delete set null
- on delete cascade
- on delete set null
on update cascade
- MySQL :: foreign key 사용하기, on update cascade, on delete set null
- on update cascade
- on update set null