Question

我需要编写一个查询来计算与给定条件匹配的字段值的总和。所以，我写了这个自定义报告功能

Function get_order_amount (ord_amount as number, inv_date as date, month as string, year as string)
    -- ...
    if inv_date(yyyymm) <= tonumber(year + month) then
        return ord_amount
    else
        return 0
    end if
End Function

现在，我希望在命令查询中使用我的函数来过滤数据总和。即：（q_sum）

SELECT EXTRACT(YEAR FROM ORDER_DATE) AS "YEAR", 
    SUM(GET_ORDER_AMOUNT(AMOUNT,INVOICE_DATE,{?P_MONTH},{?P_YEAR}))
FROM ORDERS 
GROUP BY EXTRACT(YEAR FROM ORDER_DATE)

我怎样才能做到这一点？

Answer 1

我不相信您可以将自定义函数与SQL查询混合使用。

相反，您可以直接在SQL中使用CASE语句。

案例陈述看起来像这样

Select EXTRACT(YEAR FROM ORDER_DATE) as YEAR
              , SUM(CASE
              WHEN INV_DATE <= **SOMEDATE** THEN
                        ORD_AMOUNT
              ELSE
                        0
              END) as Custom_Total
    FROM ORDERS
GROUP BY EXTRACT(YEAR FROM ORDER_DATE)

crystal report 2008.在查询中使用自定义函数或公式

1 个答案: