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How To Aplly Check Constraint

Hi to everyone,

I m new to MS SQL , i am CREATEING a Table. i want one field of table should hold only two values like (Yes,No). how is possible with aplying CHECK constraint.
plz help me to sove this problem.

Waiting for early response.
Jan 16 '07 #1
1 3803
almaz
168 Expert 100+
If your field can contain only 'YES' or 'NO', you should consider using bit data type instead.
Here is a sample of check constraint implementation:
Expand|Select|Wrap|Line Numbers
  1. create table #table (
  2.     id int identity(1,1), 
  3.     datavalue varchar(5), 
  4.     check (datavalue in ('yes', 'no'))
  5. )
  6.  
  7. insert #table (datavalue) values ('yes')    -- will pass check constraint
  8. insert #table (datavalue) values ('yes1')    -- will not pass check constraint
  9. insert #table (datavalue) values ('no')        -- will pass check constraint
  10. insert #table (datavalue) values ('yes11')    -- will not pass check constraint
  11. insert #table (datavalue) values ('no11')    -- will not pass check constraint
  12. select * from #table
  13.  
  14. drop table #table
Jan 16 '07 #2

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