用if语句汇总mysql

Question

我有以下查询：

SELECT BaDebet2 - BaCredit2 AS TOTAL FROM balansen

修改

我只想在TOTAL大于0时总结所有BaDebet2记录

Answer 1

这就是你想要的，对吧？

SELECT SUM(BaDebet2 - BaCredit2) AS TOTAL, IF(SUM(BaDebet2 - BaCredit2) > 0, SUM(BaDebet2 - BaCredit2) + BaDebet2, NULL) FROM balansen

如果TOTAL＆gt; 0您在第二列中有BaDebet2 + TOTAL，否则您将获得NULL。

Answer 2

试试这个：

SELECT 
    CASE WHEN SUM(BaDebet2 - BaCredit2)>0 
         THEN SUM(BaDebet2 - BaCredit2) + BaDebet2 
    ELSE SUM(BaDebet2 - BaCredit2) END AS TOTAL
FROM balansen

Answer 3

我认为这将解决您的问题。如果BaDebet2 - BaCredit2> 0，第二个查询将传递BaDebet2，否则为0.

SELECT SUM(BaDebet2_Actual) FROM 
(SELECT IF(BaDebet2 - BaCredit2>0, BaDebet2 ,0) AS BaDebet2_Actual 
 FROM balansen) A;