在 sql 的子查询中使用 group by

Question

如何解决这个错误：

Unable to use an aggregate or a subquery in an expression used in the GROUP BY list of a GROUP BY clause.

这是我的查询：

select Id, name,dayA,monthA,yearA, 
    sum(x) as x,
    (select SUM(x) group by month) as total,
    from table_A
    group by Id,name,monthA,dAyA,yearA, SUM(x)

换句话说：示例数据：

id name dayA monthA yearA  x
===========================
1  name1  2    3     2016   4
2  name2  2    3     2016   3
3  name1  2    3     2016   2

预期结果：

id name dayA monthA yearA  x total
===================================
1  name1  2     3     2016  4  6
2  name2  2     3     2016  3  3 
3  name1  2     3     2016  2  6

提前致谢

Answer 1

您查询的问题较多。

(select SUM(x) group by month) as total，是否来自同一个 table，不太可能，因为您的分组依据中未提及列月份。在查询中使用子查询时，必须保证i只会return一条记录。

根据您的示例数据和预期结果...

     create table table_A(
id int,
name varchar(25),
dayA int,
monthA int,
yearA int,
x int
)

insert into table_A
values (1,'name1',2,3,2016,4),
        (2,'name2',2,3,2016,3),
        (2,'name1',2,3,2016,2)


select ta.id, ta.name, ta.dayA, ta.monthA, ta.yearA, ta.x, total.Total  from table_A as ta
left join 
(select name, sum(x) as Total from table_A group by name) total on ta.name = total.name
group by
ta.id, ta.name, ta.dayA, ta.monthA, ta.yearA, ta.x, total.name, total.Total

Answer 2

可能这就是您想要的：

select table_A.*, TotalSums.total
from table_A
left join (select name, monthA, dayA, yearA, sum(x) as total from table_A group by name, monthA, dayA, yearA) as TotalSums
    on table_A.name   = TotalSums.name
    and table_A.monthA = TotalSums.monthA
    and table_A.dayA = TotalSums.dayA
    and table_A.yearA = TotalSums.yearA
order by id

Answer 3

我想这就是你要找的

select Id, main.name,dayA,main.monthA,main.yearA, 
    sum(x) as x,
    ,max(total.total) as total
    from table_A as main
    join (select SUM(x) total ,name ,monthA,yearA from table_A group by name,monthA,yearA) as total
    on main.name = total.name
     and main.monthA = total.monthA
     and main.yearA = total.yearA
    group by Id,main.name,monthA,dAyA,yearA

在 sql 的子查询中使用 group by

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