check constraint in sql

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Check constraints are used for validation while insertion.
My question is "Do they validate data while updating data" ?
if answer is No, Then is there anything else which can help out ?

Posted 28-May-13 5:32am

deepakdynamite

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Maciej Los 28-May-13 11:54am

I'm not sure i understand you well, but ff constraints are used for "validation" while insertion, why do they can't be used for "validation" while updating? Of course, they can.
What kind of situation do you have? What do you want to achieve using constraints?

gvprabu 28-May-13 11:58am

What you tried.... It will work for UPDATE also....

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CHill60 · Answer 1 · 2013-05-28T05:58:00

The easiest way to determine this would have been to try it out yourself with a sample table - e.g. the one at http://msdn.microsoft.com/en-us/library/ms188258(v=sql.105).aspx[^]

I added a constraint to that table

ADD CONSTRAINT colx CHECK (col1 >= 1 )

and then tried

SQL

INSERT INTO CheckTbl VALUES (10, 10)
update CheckTbl SET col1 = -1 where col2 = 10

which gives you

Msg 547, Level 16, State 0, Line 1
UPDATE statement conflicted with COLUMN CHECK constraint 'colx'. The conflict occurred in database 'master', table 'CheckTbl', column 'col1'.
The statement has been terminated.
(0 row(s) affected)

So your answer is "Yes"