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Asked: 2026-05-10T19:08:29+00:00

This is the constraint I have on the Customers table. ALTER TABLE Customers ADD

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This is the constraint I have on the Customers table.

ALTER TABLE Customers     ADD CONSTRAINT CN_CustomerPhone     CHECK (Phone LIKE '([0-9][0-9][0-9]) [0-9][0-9][0-9]-[0-9][0-9][0-9][0-9]')

Why does this fail?

INSERT INTO Customers (CustomerName, Address, City, State, Zip, Phone) VALUES ('Some Name','An Address', 'City goes here', 'WI', 12345, '(800) 555-1212')

With this error message.

Msg 547, Level 16, State 0, Line 1 The INSERT statement conflicted with the CHECK constraint ‘CN_CustomerPhoneNo’. The conflict occurred in database ‘Accounting’, table ‘dbo.Customers’, column ‘Phone’. The statement has been terminated.

I’m sure I’m missing something really simple, but I can’t find it.

I’ve tried simplifying the constraint to only ‘Phone LIKE ‘[0-9]” and inserting a single digit, but it still fails. WTF?

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1 Answer

  1. Check the length of the Phone field.
    Is it 15 or more characters?

    Using your code with a temp table here

      create table #temp (phone varchar(15))  ALTER TABLE #temp     ADD CONSTRAINT CN_CustomerPhone     CHECK (Phone LIKE '([0-9][0-9][0-9]) [0-9][0-9][0-9]-[0-9][0-9][0-9][0-9]')  INSERT INTO #temp (Phone) VALUES ('(800) 555-1212')  select * from #temp  drop table #temp
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