Limit SQL Server column to a list of possible values

Question

How do I put a constraint on a column so that it can only contain the following values? What do you call this type of constraint?

Allowed values: \"yes\", \"no\"         


        

Answer 1

you can use a CHECK constraint

ALTER TABLE 
ADD CONSTRAINT chk_val CHECK (col in ('yes','no','maybe'))
MSDN link

                                                        

              
                
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