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What is a Unique constraint?

April 26, 2017constraint

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10 Posted

What is a Unique constraint?

1 Answer

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10 Posted

UNIQUE Constraint : 1. ensures that no two ros of a tbale have duplicte values in the specified columns(s). 2. implicitly creattes a unique index on the specified columns. 3. index name is the given constraint name. Example : CREATE TABLE loans( loan_number NUMBER(6) NOT NULL UNIQUE, ……..