Question

我有一个如下表格，并希望根据子查询执行分析，例如sql

select from Table1 where Value (Param.internal ) > Value Param.external.

Department,  Param,      Value
Dept1,      internal,     5
Dept1,      external,     6
Dept1,      others,       10
Dept2,      internal,     4
Dept2,      external,     3
Dept2,      others,       8
Dept3,      internal,     5
Dept3,      external,     5
Dept3,      others,       7

这不起作用：

SELECT * FROM Table1 
WHERE [Values] IN ( 
    SELECT [Value] 
    FROM Table1 
    WHERE Param= 'internal' > 
    SELECT [Value] 
    FROM Table1 WHERE Param= 'external'
    )

Answer 1

这没有用：

SELECT * 
FROM Table1 
WHERE [Values] IN (SELECT [Value] 
                   FROM Table1 
                   WHERE Param= 'internal' > SELECT [Value] FROM Table1 WHERE Param= 'external')

我认为您正在尝试找到部门内部列更大的外部。

试试这个：

select Department
    ,sum(case when Param = 'internal' then Value else 0 end) as Internal
    ,sum(case when Param = 'external' then Value else 0 end) as External
    ,sum(case when Param = 'others' then Value else 0 end) as Others
    --Added based on comment
    , (SELECT COUNT(DISTINCT Department) from Table1) as CtDistinctDept
    ,sum(Value) as DeptTotal
from table1
group by department
--optional
having sum(case when Param = 'internal' then Value else 0 end)
      > sum(case when Param = 'external' then Value else 0 end)

Answer 2

我会用EXISTS编写查询：

SELECT *
FROM Table1 t1
WHERE Param = 'internal'
AND EXISTS
(SELECT 1
 FROM Table1 t2
 WHERE Param = 'external'
 AND t1.Department = t2.Department
 AND t1.value > t2.value)

所以基本上返回所有行：

Param =内部AND
还有另一行具有相同的部门名称，其中param = external，外部值小于内部值

根据您上面的示例数据，将返回第2部分。

根据评论进行编辑：如果要显示部门的所有行，您只需将上面的内容连接到主表，如下所示：

SELECT main.*
FROM Table1 main
INNER JOIN
(SELECT t1.Department
 FROM Table1 t1
 WHERE Param = 'internal'
 AND EXISTS
 (SELECT 1
  FROM Table1 t2
  WHERE Param = 'external'
  AND t1.Department = t2.Department
  AND t1.value > t2.value) sub
ON main.Department = sub.Department

分析SQL子查询

2 个答案: