In SQL we have three four major constraints - 'UNIQUE', 'FOREIGN KEY', 'CHECK' and 'NOT NULL'. Also we have non-standard ON CONFLICT clause, which propose what kind ...

Cascading referential integrity constraints are foreign key constraints that tell SQL Server to perform certain actions when a primary key field in a primary key-foreign key relationship is updated or ...

Contains a row for each object that is a CHECK constraint, with sys.objects.type = 'C'. is_disabled bit CHECK constraint is disabled. is_not_for_replication bit CHECK constraint was created with the ...

A constraint is a rule or limitation that we place on the data in a database that we can put into a column(s). A constraint is part of the table. we can apply constraints when we create the table or ...

Constraints in SQL are used to define rules for the table and columns in a database and also make sure that data are accurate and trusted in the database. Constraints are responsible for the ...