Restrict varchar() column to specific values?

sql sql-server-2008 ssms
Adam picture Adam · Mar 14, 2010 · Viewed 111.9k times · Source

Is there a way to specify, for example 4 distinct values for a varchar column in MS SQL Server 2008?

For example, I need a column called Frequency (varchar) that only accepts 'Daily', 'Weekly', 'Monthly', 'Yearly' as possible values

Is this possible to set within the SQL Server Management Studio when creating the table?

Answer

Ashish Gupta picture Ashish Gupta · Mar 14, 2010

Have you already looked at adding a check constraint on that column which would restrict values? Something like: 

CREATE TABLE SomeTable
(
   Id int NOT NULL,
   Frequency varchar(200),
   CONSTRAINT chk_Frequency CHECK (Frequency IN ('Daily', 'Weekly', 'Monthly', 'Yearly'))
)

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