You could do this with a check contraint. Here's a reference from BOL...
http://msdn.microsoft.com/en-us/library/ms179491(SQL.90).aspx
Basically you'd just do an alter Table Statement like so...
Alter Table myTable
ADD CONSTRAINT CK_mytable_Shai --or whatever meaningful name you choose
CHECK (Shai = '1234' OR Shai = '5678')
-Luke.
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