Check constraint to enforce entering a Numeric Values

I have a column Mobile_no nvarchar(8)
I need to create a check constraint to enforce the user to enter ONLY Numbers in it
ali_alannahAsked:
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santhimurthydCommented:

ALTER TABLE TABLENAME
 ADD CHECKMobileNumber (CAST(Mobile_no AS int) > 0)
0
TempDBACommented:
or something like
ALTER TABLE dbo.tableName ADD CONSTRAINT CK_MobileNumber CHECK (Mobile_no like '[0-9] [0-9] [0-9] [0-9] [0-9] [0-9] [0-9] [0-9] [0-9]')
0

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Microsoft SQL Server 2008

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