SQLite。在第一个例子中停止满足WHERE条件

Question

我已经试过这段代码，它的工作原理，但只对每个客户的第一个实例。即列应贯穿并将所有订单添加到以前的欠款中。

UPDATE customers_tbl 
    SET customer_amountowing = customer_amountowing + 
     (SELECT sorder_amount FROM standingorder_tbl 
      WHERE standingorder_tbl.sorder_customer = customers_tbl.customer_address1) 
    WHERE EXISTS 
     (SELECT * FROM standingorder_tbl 
      WHERE standingorder_tbl.sorder_customer = customers_tbl.customer_address1); 

有谁能告诉我因为我在这里错了。干杯家伙！

Answer 1

如果您要添加的所有以前的订单总和的产品，则应使用SUM函数在子查询以下列方式：

UPDATE customers_tbl 
    SET customer_amountowing = customer_amountowing + 
     (SELECT SUM(sorder_amount) FROM standingorder_tbl 
      WHERE standingorder_tbl.sorder_customer = customers_tbl.customer_address1) 
    WHERE EXISTS 
     (SELECT * FROM standingorder_tbl 
      WHERE standingorder_tbl.sorder_customer = customers_tbl.customer_address1);