Help with a simple Alter Query statement

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Help with a simple Alter Query statement

Author

Topic

II Traveler II
Starting Member

11 Posts

Posted - 2011-11-22 : 12:46:02

So I have coded an Alter Table statement that adds a constraint that requires the InvoiceTotal to be greater than the sum of the PaymentTotal and the CreditTotal. The problem is, when I run the statement, I get the error "The ALTER TABLE statement conflicted with the CHECK constraint "Constraint2". The conflict occurred in database "AP", table "dbo.Invoice"." Any solutions? Here's the code.

ALTER TABLE Invoices
ADD CONSTRAINT Constraint2 CHECK  (InvoiceTotal > (PaymentTotal + CreditTotal))

Lamprey
Master Smack Fu Yak Hacker

4614 Posts

Posted - 2011-11-22 : 12:53:59

It appears you have rows that violate that constraint. Do a select from your table using the check constraint as your predicate and see which rows, currently, violate that constraint. I.E.:

SELECT *
FROM Invoices
WHERE NOT(InvoiceTotal > (PaymentTotal + CreditTotal))

visakh16
Very Important crosS Applying yaK Herder

52326 Posts

Posted - 2011-11-22 : 12:56:58

you can create it like below if you want it to ignore existing values (though it doesnt make much sense to retain them like that!)


ALTER TABLE Invoices WITH NOCHECK
ADD CONSTRAINT Constraint2 CHECK  (InvoiceTotal > (PaymentTotal + CreditTotal))

------------------------------------------------------------------------------------------------------
SQL Server MVP
http://visakhm.blogspot.com/

II Traveler II
Starting Member

11 Posts

Posted - 2011-11-23 : 17:38:30

Thanks Lamprey! I was afraid that my rows might have violated the rule. I just didn't think of a way to check or confirm that.

And thanks to you, visakh16! You always come up with a great solution! I should have thought of that.

visakh16
Very Important crosS Applying yaK Herder

52326 Posts

Posted - 2011-11-25 : 08:42:20

quote:
Originally posted by II Traveler II

Thanks Lamprey! I was afraid that my rows might have violated the rule. I just didn't think of a way to check or confirm that.

And thanks to you, visakh16! You always come up with a great solution! I should have thought of that.

wc

------------------------------------------------------------------------------------------------------
SQL Server MVP
http://visakhm.blogspot.com/

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