Why do constraints? What harmful actions does a referential integrity constraint prevent? The benefits of the CONSTRAINT
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The benefits of the CONSTRAINT constraintname CHECK are usually obvious; why is the CHECK constraint no longer enforced in the CREATE TABLE? Where are the CHECK constraints that used to be in the CREATE TABLE placed in the current versions of the major DBMSs?
Related Book For
Concepts of Database Management
ISBN: 978-1285427102
8th edition
Authors: Philip J. Pratt, Mary Z. Last
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