Check if a variable contains any non-numeric digits in SQL Server

Question

I've a query like below:-

DECLARE @rptID VARCHAR(8)
SET @rptID = (SELECT reportID FROM Reports)

In general @rptID contains numeric digits like '00001234' etc. But is there any way to validate if the variable @rptID contains any non-numeric value in it.

For ex.

IF (@rptID contains non-numeric value)
            THEN throw Error

Answer 1

Check for any characters that are not in the range 0 to 9

^ is not in LIKE expressions

IF @rptID LIKE '%[^0-9]%'
   --throw error 

Answer 2

There is also an ISNUMERIC function in MSSQL if you're using version 2008 or later.

mentioned link

IF (not ISNUMERIC(@rptID) = 1)
    THEN throw Error