column can only enter letters of the alphabet

Hi experts,
as I can validate that a column can only enter letters of the alphabet
enrique_aeoAsked:
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Anthony PerkinsCommented:
You need to add a CONTRAINT on that column something like this:
ALTER TABLE dbo.YourTableName ADD CONSTRAINT AlphaOnly CHECK (PATINDEX('%[^A-Z]%', YourColumnName) > 0)
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enrique_aeoAuthor Commented:
HI
create table datosPersonales (nombre varchar(100))
go
ALTER TABLE datosPersonales
      ADD CONSTRAINT nombre CHECK (PATINDEX('%[^A-Z]%', nombre) > 0)
      
insert into datosPersonales values ('ABCD')
i have this error
Msg 547, Level 16, State 0, Line 1
The INSERT statement conflicted with the CHECK constraint "nombre". The conflict occurred in database "AdventureWorks", table "dbo.datosPersonales", column 'nombre'.
The statement has been terminated.

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chapmandewCommented:
Use WITH NOCHECK
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Anthony PerkinsCommented:
It means you already have data that conflicts with your own rules.  If you do not care about existing data than use WITH NOCHECK.
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Anthony PerkinsCommented:
Oops I am sorry it looks like I mislead you the check constraint should have read:
ALTER TABLE dbo.YourTableName ADD CONSTRAINT AlphaOnly CHECK (PATINDEX('%[^A-Z]%', YourColumnName) = 0)
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Microsoft SQL Server 2008

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