Question

您好我有这个select语句;

select 
   I.itemno,
   avg(D.unit_price) as average 
from 
   INVENTORY I, 
   ORDER_DTL D 
where 
   I.id = D.INVENTORY_ID 
   group by I.itemno;

我想以平均销售价格更新INVENTORY表中的另一列。有没有办法在一个声明中这样做？

由于詹姆斯

Answer 1

UPDATE INVENTORY A SET avg_price = 
(select 
   avg(D.unit_price) as average 
from 
   INVENTORY I, 
   ORDER_DTL D 
where 
   I.id = D.INVENTORY_ID 
 AND I.itemno = A.itemno
   group by I.itemno);

这不会有帮助吗？

Oracle SQL如何从select语句创建更新脚本

1 个答案:

SQL Fiddle