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Explain the Check Clause
The CHECK clause is employed to at the end of a CREATE TABLE statement specify table constraints. This is known as table-based constraint because it applies to every tuple individually and is checked when a tuple is inserted or modified.
The CHECK clause can as well be used to fixed more general constraints by using the CREATE ASSERTION statement of SQL.
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Update or Modify operation alters the existing values. If these operations alter the value that is the foreign key also, the only check need is the similar as that of the Insert op
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