• Either change the sql query

    SELECT col1, CASE WHEN col3 = 'DEL' THEN 0 ELSE col2 END AS [col2], col3

    FROM

    Or use an expression for column 2

    =IIF(Fileds!col3.Value = "DEL",0,Fileds!col2.Value)

    Far away is close at hand in the images of elsewhere.
    Anon.