Question

我在执行以下查询时遇到“无效使用组功能”错误。

Select id, faultdistribution, faulttype, faultseverity, 
SUM(IF (faultdistribution='crs', SUM(IF(faultdistribution='crs',1,0))*8, 0)+
IF (faultdistribution='configuration', SUM(IF(faultdistribution='configuration',1,0))* 6, 0)+
IF (faulttype='business' AND faultseverity='fatal', SUM(IF(faulttype='business' AND faultseverity='fatal',1,0))* 4, 0)+
IF (faulttype='business' AND faultseverity='major', SUM(IF(faulttype='business' AND faultseverity='major',1,0))* 2, 0)+
IF (faulttype='business' AND faultseverity='moderate', SUM(IF(faulttype='business' AND faultseverity='moderate',1,0))* 5, 0)+
IF (faulttype='business' AND faultseverity='minor', SUM(IF(faulttype='business' AND faultseverity='minor',1,0))* 3, 0)+
IF (faulttype='look & feel' AND faultseverity='fatal', SUM(IF(faulttype='look & feel' AND faultseverity='fatal',1,0))* 2, 0)+
IF (faulttype='look & feel' AND faultseverity='major', SUM(IF(faulttype='look & feel' AND faultseverity='major',1,0))* 1, 0))
FROM tbl_fault WHERE product='DAS' AND faultdistribution='missed'

我做错了什么？请帮助！

Answer 1

SUM（），COUNT（），AVG（），MIN（），MAX（）等是需要您指定GROUP BY的聚合函数，除非您在SELECT中的每一列上使用它们。列表。

在您的情况下，查询应该通过在底部添加以下内容来工作：

GROUP BY id, faultdistribution, faulttype, faultseverity

...但是根据你所拥有的许多嵌套的IF，我不完全确定这会给你你正在寻找的输出。

Answer 2

尝试这个缩短的查询

 Select id, faultdistribution, faulttype, faultseverity, 
 IF (faultdistribution='crs', 1,0)*8 +
 IF (faultdistribution='configuration', 1,0)* 6 +
 IF (faulttype='business' AND faultseverity='fatal', 1,0)* 4 +
 IF (faulttype='business' AND faultseverity='major', 1,0)* 2 +
 IF (faulttype='business' AND faultseverity='moderate', 1,0)* 5 +
 IF (faulttype='business' AND faultseverity='minor', 1,0)* 3 +
 IF (faulttype='look & feel' AND faultseverity='fatal', 1,0)* 2 +
 IF (faulttype='look & feel' AND faultseverity='major', 1,0)* 1 as mysum
 FROM tbl_fault WHERE product='DAS' AND faultdistribution='missed'
 group by id , faultdistribution ,faulttype ,faultseverity

MySQL查询 - 无效使用组函数 - 使用SUM

2 个答案: