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check constraint [message #374587] Wed, 20 June 2001 06:47
Bonnie Melanson
Messages: 3
Registered: April 2001
Junior Member
I have a check constraint as follows:

check (column_name in ('Y',null))

I only want to allow either null or 'Y' entries, however the database will allow ANY entry. How do I allow only a 'Y' or a null value?????

Thanks!

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