Question

我在从两个表中指定货币（价格）的SUM时遇到问题。结果错误的SUM结果问题。
我的查询：

SELECT SUM(up2.price + uf1.price) AS TotalCredit
FROM user_faktorha AS uf1, u_payment AS up2
WHERE uf1.`acc_id` = '11784' && up2.`Account`='11784' && up2.`Active`='1'

表格user_faktorha列Price包含正数和负数表格u_payment列Price只有正数。

出了什么问题？

Answer 1

试试这个

      SELECT  (up2.price + uf1.price) AS TotalCredit
      FROM user_faktorha AS uf1, u_payment AS up2
      WHERE uf1.`acc_id` = '11784' && up2.`Account`='11784' && up2.`Active`='1'

因为你会添加它们，你不需要SUM

Answer 2

我可能会建议您稍微改变一下语法。以下是两种选择：

SELECT up2.price + uf1.price AS TotalCredit
FROM user_faktorha AS uf1
INNER JOIN u_payment AS up2
  on uf1.acc_id = up2. Account
WHERE uf1.`acc_id` = '11784' && up2.`Active`='1';

或者

SELECT sum(up2.price + uf1.price) AS TotalCredit
FROM user_faktorha AS uf1
INNER JOIN u_payment AS up2
  on uf1.acc_id = up2. Account
WHERE uf1.`acc_id` = '11784' && up2.`Active`='1'
GROUP BY uf1.acc_id

注意两个表之间使用的INNER JOIN语法，它们现在加入acc_id。同样在第一个版本中，我没有使用聚合函数，我只在两个表中添加price，而第二个版本使用sum()聚合并添加group by

MySQL SUM FROM两个表结果错误

2 个答案: