MSSQL：获取总计的小计

如何编写查询以获取总计的小计？下面是一个例子

select
task_id,
client_id,
SUM(value1 + value2) AS 'Total 1',
SUM(value3 + value4) AS 'Total 2',
--pseudocode
SUM(Total 1 + Total 2) AS 'Total 1 + Total 2'
from table1
GROUP BY task_id,client_id

预期成果：

task_id | client_id | Total 1 | Total 2 | Total 1 + Total 2 |
   1         4          2          4            6

---

它可以将其包装在子查询中：

SELECT 
    task_id
    , client_id
    , [Total 1]
    , [Total 2]
    , SUM([Total 1], [Total 2]) AS 'Total 1 + Total 2'
FROM
(
  select
    task_id,
    client_id,
    SUM(value1 + value2) AS 'Total 1',
    SUM(value3 + value4) AS 'Total 2',
    --pseudocode
    SUM(Total 1 + Total 2) AS 'Total 1 + Total 2'
  from table1
  GROUP BY task_id,client_id
) a 
GROUP BY task_id, client_id

或者，您可以简单地添加原始值，而不是使用

SUM

：

select
task_id,
client_id,
SUM(value1 + value2) AS 'Total 1',
SUM(value3 + value4) AS 'Total 2',
--pseudocode
value1 + value2 + value3 + value4 AS 'Total 1 + Total 2'
from table1
GROUP BY task_id,client_id

---

不能在同一选择中重复使用列别名。相反，只需重复以下操作：

select task_id, client_id,
       SUM(value1 + value2) AS [Total 1],
       SUM(value3 + value4) AS [Total 2],
       SUM(value1 + value2 + value3 + value4) AS [Total 1 + Total 2]
from table1
group by task_id, client_id;

---

如果重复操作是繁琐的，那么你可以考虑子查询或CTE。< /P>你需要第二个查询中的和。它仍然是一个聚合，只是所有列的总和。