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Table Constraints in SQL: NOT NULL, DEFAULT, UNIQUE, and CHECK
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This SQL tutorial discusses the common constraints one can place on a table: NOT NULL, DEFAULT, UNIQUE, and CHECK, including the purpose of each constraint, as well as how to apply each constraint to a table during table creation.
0:24 NOT NULL Constraint
0:56 DEFAULT Constraint
2:03 UNIQUE Constraint
2:34 CHECK Constraint
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