Question

我有一个SQL查询：

select el as COL_1, sum(volume) as COL_2 
from table1
where el like 'False%' and Month = 'SEP' and year(RollUpDate) = '2014' group by el
union
select el as COL_1, sum(volume) as COL_2 
from table1
where el = 'True' and Month = 'SEP' and year(RollUpDate) = '2014' group by el

将带回来：

true   | 12
false a| 12
false b| 13
false 2| 3

我想要做的就是结合这些谬误，这样我就可以用一个错误和一个假卷的总和带回一个更清晰的结果即。

true   | 12
false  | 55

任何帮助表示赞赏，sql server 2008 btw

编辑：嗯，这些解决方案很棒，大多数都按照描述工作，但是我不能在严格的jdbc设置中使用它们，所以我不能使用case语句。 Jarlh的答案很接近，但是当返回null结果时，它仍然有那些已创建的列，如果有一个简单的方法通过不使用case语句返回null，那将是完美的

Answer 1

您可以将查询用作表格，并从中选择与常规表格或临时表格相同的表格。

SELECT t.COL_1, sum(t.COL_2) FROM
    ((select el as COL_1, sum(volume) as COL_2 
    from table1
    where el like 'False%' and Month = 'SEP' and year(RollUpDate) = '2014' group by el)
    union all
    (select el as COL_1, sum(volume) as COL_2 
    from table1
    where el = 'True' and Month = 'SEP' and year(RollUpDate) = '2014' group by el)) t
WHERE t.COL_1 = 'false'
GROUP BY t.COL_1

Answer 2

使用子查询和聚合：

select col_1, sum(Col_2)
from ((select el as COL_1, sum(volume) as COL_2 
       from table1
       where el like 'False%' and Month = 'SEP' and year(RollUpDate) = '2014'
       group by el
      ) union all
      (select el as COL_1, sum(volume) as COL_2 
       from table1
       where el = 'True' and Month = 'SEP' and year(RollUpDate) = '2014'
       group by el
      )
     ) t
group by col_1;

但是，这太复杂了。你可以这样做：

select (case when el like 'False%' then 'false'
             else 'True'
        end) as COL_1, sum(volume) as COL_2 
from table1
where (el = 'True' or el like 'False%') and Month = 'SEP' and year(RollUpDate) = '2014'
group by (case when el like 'False%' then 'false'
               else 'True'
          end)

也就是说，您根本不需要union。只需对用于聚合的列使用case语句。

编辑：

实际上，原始查询区分了各种形式的“虚假”。上一个查询可能是OP想要的，但以下更类似于原始查询：

select el as COL_1, sum(volume) as COL_2 
from table1
where (el = 'True' or el like 'False%') and Month = 'SEP' and year(RollUpDate) = '2014'
group by el;

Answer 3

select 'False' as COL_1, sum(volume) as COL_2 
from table1 where el like 'False%' and Month = 'SEP' and year(RollUpDate) = '2014'
union all
select 'True' as COL_1, sum(volume) as COL_2 
from table1
where el = 'True' and Month = 'SEP' and year(RollUpDate) = '2014'

Answer 4

嗯，虽然所有的答案都是正确的，但尽管@Jarlh已经接近，但它们并不是我想要的。

我想创建一个提供true和false行的临时列，但是当volume row为null时没有出现。这就是我最终的结果：

    select 'False' as COL_1, coalesce(sum(volume),0) as COL_2 from tl1 where el like 'False%' and Month = :month and year(RollUpDate) = :year having sum(Volume) is not null 
union 
select 'True' as COL_1, coalesce(sum(volume),0) as COL_2 from tbl1 where el = 'True' and Month = :month and year(RollUpDate) = :year having sum(Volume) is not null

组合查询中的行

4 个答案: