如何在SAP HANA中的過程中分配變量

Question

在這里，我嘗試根據使用過程訂購的數量給予折扣。 但是我不知道如何在過程中將列的值分配給變量。

這是我的代碼：

create column table "KABIL_PRACTICE"."SALES_IF_ELSE"
(
"SALES_ID" integer,
"PRODUCT_ID" integer,
"QTY" integer,
"DISCOUNT" integer,
"SALES_AMOUNT" Double
);

insert into "KABIL_PRACTICE"."SALES_IF_ELSE" ("SALES_ID","PRODUCT_ID","QTY","SALES_AMOUNT") values (1,101,15,1500);
insert into "KABIL_PRACTICE"."SALES_IF_ELSE" ("SALES_ID","PRODUCT_ID","QTY","SALES_AMOUNT") values (2,102,25,2500);
insert into "KABIL_PRACTICE"."SALES_IF_ELSE" ("SALES_ID","PRODUCT_ID","QTY","SALES_AMOUNT") values (3,103,35,3500);
insert into "KABIL_PRACTICE"."SALES_IF_ELSE" ("SALES_ID","PRODUCT_ID","QTY","SALES_AMOUNT") values (4,104,40,4000);
insert into "KABIL_PRACTICE"."SALES_IF_ELSE" ("SALES_ID","PRODUCT_ID","QTY","SALES_AMOUNT") values (5,105,27,2700);
insert into "KABIL_PRACTICE"."SALES_IF_ELSE" ("SALES_ID","PRODUCT_ID","QTY","SALES_AMOUNT") values (6,106,32,3200);
insert into "KABIL_PRACTICE"."SALES_IF_ELSE" ("SALES_ID","PRODUCT_ID","QTY","SALES_AMOUNT") values (7,107,19,1900);

create procedure "KABIL_PRACTICE"."IF_ELSE_DISC"
language sqlscript
as begin
declare QTY integer ;
select "QTY" from "KABIL_PRACTICE"."SALES_IF_ELSE" := QTY;
if ( QTY > 25)
then
update "KABIL_PRACTICE"."SALES_IF_ELSE" set "DISCOUNT" = 5;
else if
update "KABIL_PRACTICE"."SALES_IF_ELSE" set "DISCOUNT" = 1;
end if;
end if;
end;

任何人都可以幫助我...

Answer 1

這是一個典型的案例，沒有足夠使用SQL，而是試圖在SQL數據庫上強制使用命令式編程風格。 您要做的就是根據條件更新表，不是嗎？

在那種情況下，根本不需要過程邏輯（對於任何SQL數據庫都是如此）。

UPDATE "KABIL_PRACTICE"."SALES_IF_ELSE" 
SET "DISCOUNT" = (CASE WHEN "QTY" >25 
                     THEN 2 
                     ELSE 1 
                  END) ;

這將在單個命令中無循環地將計算出的"DISCOUNT"值存儲在表中。

Answer 2

您可以通過選擇變量來分配變量。 例如：

SELECT QTY INTO QTY FROM KABIL_PRACTICE.SALES_IF_ELSE