Is it possible to force a value in at least one of several columns?

Is it possible to define a constraint that says at least one of a set of columns must have a value?
I have a table of securities. There are three types of security identifiers that I am recording: CUSIP, SEDOL, ISIN. So I have a column for each type of identifier. Is it possible to set a constraint to make sure that at least one of those
columns has a value?
Thanks.
J
http://digitalcamel.blogspot.com/

Hi J,
Try like this,
CREATE TABLE T1
CUSIP int ,
SEDOL int,
ISIN int,
CHECK (CUSIP IS NOT NULL OR SEDOL IS NOT NULL OR ISIN IS NOT NULL)
INSERT T1 SELECT 1,NULL,NULL
INSERT T1 SELECT NULL,2,NULL
INSERT T1 SELECT NULL,NULL,3
INSERT T1 SELECT NULL,NULL,NULL
SELECT * FROM T1
sathya - www.allaboutmssql.com ** Mark as answered if my post solved your problem and Vote as helpful if my post was useful **.

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