January 2021 - ASRblogger

Part 2: NOT NULL & Unique Constraints in SQL

NOT NULL Constraints The NOT NULL constraint ensures that the column contains no null values. Columns without the NOT NULL constraint can contain null values by default. NOT NULL constraints…

asrblogger January 21, 2021No Comments

Oracle

Part 1: Constraints in SQL

Purpose: Use a constraint to define an integrity constraint—a rule that restricts the values in a database. The Oracle server uses constraints to prevent invalid data entry into tables. You…

asrblogger January 3, 2021No Comments

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Part 2: NOT NULL & Unique Constraints in SQL

Part 1: Constraints in SQL

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