Tell me what is a constraint? And its types?
Submitted by: Muhammad☛ Constraint is a rule imposed on data.
☛ Different types of constraint:
☛ Primary key
☛ Unique
☛ Not null
☛ Foreign key
☛ Composite foreign key
☛ Check constraint
Submitted by: Muhammad
☛ Different types of constraint:
☛ Primary key
☛ Unique
☛ Not null
☛ Foreign key
☛ Composite foreign key
☛ Check constraint
Submitted by: Muhammad
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