Data Modeling Question: Download Data Modeling PDF
Tell me what is a constraint? And its types?
Answer:
☛ Constraint is a rule imposed on data.
☛ Different types of constraint:
☛ Primary key
☛ Unique
☛ Not null
☛ Foreign key
☛ Composite foreign key
☛ Check constraint
☛ Different types of constraint:
☛ Primary key
☛ Unique
☛ Not null
☛ Foreign key
☛ Composite foreign key
☛ Check constraint
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