如何在 4gl 中使用变量进行“分组”

有没有办法在 4gl 查询中按表中的字段对记录进行分组？

My code.

  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，非常基本：

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.