group-by-clause

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priyasingh1352 / Constraints-and-Conditions-in-SQL

In SQL, constraints are predefined rules applied to table columns to ensure the accuracy, reliability, and integrity of data. They restrict the type of data that can be entered, updated, or deleted; if an operation violates these rules, it is aborted by the database engine.

sql constraints conditions workbench whereclause group-by-clause

Updated May 24, 2026

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