Видео с ютуба Check-Constraints

MySQL: CHECK constraint is easy

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MySQL Check Constraint

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18 Check constraint in sql server

SQL CHECK Constraint

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SQL CHECK Constraints: A Step-by-Step Tutorial

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MySQL Constraints Tutorial with 20+ Examples - NOT NULL, UNIQUE, DEFAULT, CHECK, PRIMARYKEY, INDEXES

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37 SQL Server - SQL CHECK Constraint

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SQL Tutorial - CHECK Constraints