SQLite的。在第一个实例停止WHERE条件

Question

我已经尝试过这段代码但它只能在每个客户的第一个实例上运行。即列应该贯穿并将所有订单添加到之前的欠款中。

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 );

谁能告诉我，我在这里出错了。干杯们!!

Answer 1

如果要添加所有先前订单的总和，则应以下列方式在子查询中使用SUM函数：

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 );