Question

work on sql-server-2005

  SELECT    A.specific_customization_id ,
            A.customization_id ,
            A.customization_value ,
            A.customization_price ,
            A.customization_cost ,
            A.customization_code ,
            A.customization_check ,
            A.sort_order ,
            A.option_code ,
            A.product_id ,
            A.image_1 ,
            A.image_2 ,
            A.MainProductID ,
            A.customization_product_id ,
            A.inactive ,
            A.customization_description ,
            A.customization_select ,
            A.UOM ,
            A.allow_recur ,
            auto_reorder = CASE A.MainProductID --it's an int type column
                             WHEN NULL THEN A.allow_recur
                             ELSE ( SELECT  allow_recur
                                    FROM    wc_product
                                    WHERE   product_id = A.MainProductID
                                  )
                           END
  FROM      dbo.wc_product_specific A
  WHERE     A.product_id = 1133

Using the above query I want to set auto_reorder column value .want to set two login

1. When My MainProductID column is null I want to set allow_recur column value
2. When it’s not null I want to set another table column value

My logic 2) works fine ,fail to understand why does 1) not work? Help me to fix the problem?

If have any query plz ask thanks in advance.

Answer 1

Does this work:?

SELECT    A.specific_customization_id ,
            A.customization_id ,
            A.customization_value ,
            A.customization_price ,
            A.customization_cost ,
            A.customization_code ,
            A.customization_check ,
            A.sort_order ,
            A.option_code ,
            A.product_id ,
            A.image_1 ,
            A.image_2 ,
            A.MainProductID ,
            A.customization_product_id ,
            A.inactive ,
            A.customization_description ,
            A.customization_select ,
            A.UOM ,
            A.allow_recur ,
            A.auto_reorder = CASE  --it's an int type column
                             WHEN A.MainProductID IS NULL THEN A.allow_recur
                             ELSE B.allow_recur
                             END

  FROM      dbo.wc_product_specific A
            left outer join wc_product B on  B.product_id = A.MainProductID
  WHERE     A.product_id = 1133