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#check

Commands grouped around the same concept, pattern, or recurring problem.

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beginner data-quality MySQL MariaDB SQL Server PostgreSQL SQLite

Find Rows That Violate A Data Rule

Use a `WHERE` predicate to list rows that already break a business or constraint rule.

intermediate defining MySQL MariaDB SQL Server PostgreSQL SQLite

Validate Column Values With CHECK

Use a `CHECK` constraint to reject rows whose values fall outside an allowed rule.