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What is Understanding DDL Constraints in SQL about?

The document discusses different types of constraints in Oracle databases. It describes domain integrity constraints like NOT NULL and check constraints. It also covers entity integrity constraints including unique, primary key constraints. Referential integrity constraints involving foreign keys are explained. The key points are: - Constraints can be added at the column, table, or alter level. - Common constraints include NOT NULL, UNIQUE, PRIMARY KEY, FOREIGN KEY. - Operations on constraints are enab

Author

Vinoth Sivaperumal

Language

EN