mysql - 将两个 Mysql SUM select 查询合并为一个查询

Question

我有以下两个查询的 SUM 值
查询 1:*

SELECT SUM(price) FROM TABLE1 WHERE acc_id = '555'

查询2:

SELECT SUM(price) FROM TABLE2 WHERE account = '555' && active='1'

我尝试组合这两个查询，但给出了错误的总和结果，例如，如果 query1 sum is: -86500 和 Query2 sum is: 76000，RESULT 必须是 -10500 但结果显示为 -486000

我正在尝试这样，但我没有得到预期的结果。

SELECT SUM(t1.price + t2.price) AS TotalCredit 
FROM TABLE1 AS t1, TABLE2 AS t2 
WHERE t1.`acc_id` = '555' && t2.`Account`='555' && t2.`Active`='1'

表格图片:

Answer 1

由于加入记录的数量得到重复，你得到一个更高的总和值 试试这个

SELECT sum(prc) 
FROM (
    SELECT SUM(price) prc FROM TABLE1 WHERE acc_id = '555'
    union all 
    SELECT SUM(price) prc FROM TABLE2 WHERE account = '555' && active='1'
) a