Is there another solution for SQL server

Question

I have a small problem :

SELECT *
FROM  ZGA_DASHBOARD_FINAL
full outer join A_SGA_Name_ID_Final ON cast(REFERENCE_KEY1 as integer) =A_SGA_Name_ID_Final.[PERSONID_EXT]
WHERE ISNUMERIC(REFERENCE_KEY1) = 1 

For my output I have this error : Conversion failed when converting the varchar value 'CORRECT' to data type int.

and when I change full outer join by Inner join it works Someone had the same problem.. Thanks in advance

Answer 1

You can use a CTE to first limit the records where the ISNUMERIC returns true:

; WITH NumericReference
AS (
    SELECT *
    FROM  ZGA_DASHBOARD_FINAL
    WHERE ISNUMERIC(REFERENCE_KEY1) = 1
    )
    SELECT *
    FROM  [NumericReference] nr
    FULL OUTER JOIN A_SGA_Name_ID_Final af 
        ON CAST(nr.REFERENCE_KEY1 AS INTEGER) = af.[PERSONID_EXT]