Commonly used SQL Server Constraints: FOREIGN KEY, CHECK and DEFAULT
Constraints in SQL Server
SQL CHECK Constraint
the database experts Doc/Check constraint
Database Fundamentals #33: Check Constraints from the GUI - Grant Fritchey
the database experts Doc/Constraint
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Database Constraints in SQL Server and How to Model Them in Vertabelo | Vertabelo Database Modeler
Ability to create CHECK constraints in "Add constraint for table" dialog for Oracle · Issue #9081 · dbeaver/dbeaver · GitHub
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SQL 2008 Tutorial Check Constraints - YouTube
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