It is not possible to have custom deletion constraints
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Keep practicing — related questions
- Table (having constraint) can only be delete by
- Constraints can be specified after a table is created
- Using ALTER TABLE command one can only ADD or DROP a constraint, but NOT MODIFY it's structure.
- CONSTRAINTS can be specified only on Creation of a table.
- A constraint is applied to a row and not a column
- Can I define multiple unique constraints on a table?
- NOT NULL constraint can be added using MODIFY clause of ALTER TABLE statement
- It is possible to create a constraints on the existing tables by creating new column