What are the usefulness of primary key secondary key and stored proced – InterviewSolution

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1.	What are the usefulness of primary key secondary key and stored procedure in relational database?
Answer» A relational database includes tables containing rows and COLUMNS. ... Entity integrity ensures that the PRIMARY keyin a table is unique and that the value is not set to null. Referential integrity requires that every value in a foreign key COLUMN will be found in THEPRIMARY key of the table from which it originated.

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