CHECK Clause : Check « Constraints « SQL Server / T-SQL Tutorial






  1. SQL Server / T-SQL Tutorial
  2. Constraints
  3. Check
[CONSTRAINT c_name]
        CHECK [NOT FOR REPLICATION] expression

expression must evaluate to a Boolean value (TRUE or FALSE)


11> CREATE TABLE customer
12>         (cust_no INTEGER NOT NULL,
13>         cust_group CHAR(3) NULL,
14>         CHECK (cust_group IN ('c1', 'c2', 'c10')))
15> GO
1>
2> drop table customer;
3> GO








7.5.Check
7.5.1.Using CHECK Constraints
7.5.2.Adding a CHECK Constraint to an Existing Table
7.5.3.Constraints with name
7.5.4.CHECK Clause
7.5.5.Check Constraint
7.5.6.CHECK (DATEPART(DAY, GETDATE()) < 28)
7.5.7.A check constraint uses an expression to qualify records that are acceptable for any Inserts or Updates
7.5.8.Use or to link two conditions for check constraint
7.5.9.Using a Multicolumn CHECK Constraint
7.5.10.Check for data length
7.5.11.Pattern based constraint
7.5.12.Mark nocheck for a constraint
7.5.13.A table-level check constraint that limits Banker IDs to a specific format