是否有一个4GL查询中的方式来组记录由表中的一个字段?
我的代码。
define variable v-invoice as inte no-undo.
define variable v-sell-price as decimal no-undo.
define variable v-cost-price as decimal no-undo.
define variable iinv as integer no-undo.
For each Order no-lock :
v-invoice = Order.tblinvoice.
v-sell-price = Order.sell-price.
v-cost-price = Order.cost-price.
iinv = iinv + Order.sell-price.
display Order.invoice Order.sell-price.
end.
谢谢
是的,当然可以,非常简单:
DEFINE VARIABLE v-sell-price AS INTEGER NO-UNDO.
DEFINE VARIABLE v-cost-price AS INTEGER NO-UNDO.
FOR EACH order BREAK BY order.invoice:
/* Sum the prices */
ASSIGN
v-sell-price = v-sell-price + Order.sell-price.
v-cost-price = v-cost-price + Order.cost-price.
/* On the last order matching this order display and reset sums */
IF LAST-OF(order.invoice) THEN DO:
DISPLAY Order.invoice v-sell-price v-cost-price.
ASSIGN
v-sell-price = 0
v-cost-price = 0.
END.
END.
其实这是个什么ACCUMULATE语句和ACCUM功能都是为了。我觉得对于那些有点难以记得确切的语法(有时很难理解,甚至阅读在线帮助后),所以我常常诉诸Jensd的回答积累变量自己等。您的示例中的代码看起来应该像这样(语法检查,但是未测试):
FOR EACH order BREAK BY order.invoice:
accumulate Order.sell-price (sub-total by order.invoice).
accumulate Order.cost-price (sub-total by order.invoice).
IF LAST-OF(order.invoice) THEN
DISPLAY Order.invoice
accum sub-total by order.invoice Order.sell-price
accum sub-total by order.invoice Order.cost-price.
END.