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What are constraints? Explain different types of
constraints?
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Answer Posted / ravi gupta
constraint define rules that must be followed to maintain
consistency and correctness of data.a constraint can either
be created while creating a table or can be added later.
constraint can be divided into the following types:--
(1)primary key constraint.
(2)unique constraint.
(3)foreign key constraint.
(4)check constraint.
(5)default constraint.
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