在SQL WHERE中执行IF

Question

我想做这个

SELECT *
  FROM sales_order_header       
 WHERE order_reference LIKE @order_reference + '%'
   AND ((@booked_in IS NULL) OR ( booked_in = @booked_in))
   AND ((@depot_assigned IS NULL) OR ( IF @depot_assigned = 'Y' depot_code <> ' ' ELSE depot_code = ' ') )

我相信你们都可以猜到OR(IF @dede_assigned等)位失败了.

我该怎么做这样的事情,或者我必须根据@depot_assigned参数的值将它作为两个单独的select语句来完成.

Answer 1

SELECT
        *

    FROM
        sales_order_header

    WHERE
        order_reference LIKE @order_reference + '%'         AND
        ((@booked_in IS NULL) OR ( booked_in = @booked_in)) AND
        ((@depot_assigned IS NULL) OR 
            ( @depot_assigned = 'Y' AND depot_code <> ' ' ) OR
            ( @depot_assigned <> 'Y' AND depot_code = ' ') )