Question

在ms-sql中我使用聚合组来按用户过滤结果，我还想使用大小写来过滤未包含在聚合中的行，这样所有用户结果都在1行上。我不确定这是可能的。

以下是下面的查询，将结果分成两行。

select case  when col_A='1' then sum(col b) End as Sum1_results,
case  when col_A='2' then sum(col_b) End as Sum2_Results, Username from tbl1
group by Username, col_A

结果的例子是。

Sum1_results | Sum2_results | Username 

 5499          null           John
 null          3400           John

理想情况下，如果可能的话，我希望将这些结果合并为每个用户名的一行。任何帮助将不胜感激

Answer 1

您可以使用：

select Username ,
     SUM(case when col_A='1' then col_b End) as Sum1_results,
     SUM(case when col_A='2' then col_b End) as Sum2_Results, 
from tbl1
group by Username

Answer 2

下面的查询可以完成这项工作

    Create table #tmp (col_A CHAR(1),col_b int,Username VARCHAR(10))

    INSERT INTO #tmp VALUES('1',5000,'John')
    INSERT INTO #tmp VALUES('2',400,'John')
    INSERT INTO #tmp VALUES('1',499,'John')
    INSERT INTO #tmp VALUES('2',3000,'John')

    SELECT * FROM #tmp

    select SUM(case when col_A='1' then col_b End) as Sum1_results,
         SUM(case when col_A='2' then col_b End) as Sum2_Results,Username 
    from #tmp

    group by col_A,UserName

    DROP TABLE #tmp

Answer 3

每个用户名的结果合并为一行。

创建表#tmp（col_A CHAR（1），col_b int，Username VARCHAR（10））

INSERT INTO #tmp VALUES('1',5000,'John')
INSERT INTO #tmp VALUES('2',400,'John')
INSERT INTO #tmp VALUES('1',499,'John')
INSERT INTO #tmp VALUES('2',3000,'John')

SELECT * FROM #tmp

select SUM(case when col_A='1' then col_b End) as Sum1_results,
     SUM(case when col_A='2' then col_b End) as Sum2_Results,Username 
from #tmp

group by UserName

DROP TABLE #tmp

在聚合sql查询中使用大小写而不拆分行

3 个答案: