Sql 在另一个语句中使用语句的结果

我有以下两条SQL语句

select 
    Fleet, SUM(hours) as Operating 
from 
    table
where 
    colE = 'Operating' 
    and START_TIME >= '2012-01-01' and END_TIME<='2013-01-01' 
    and FLEET IS NOT NULL
group by 
    fleet 
order by 
    FLEET asc


select Fleet, SUM(hours) as Delay
from table
    where colE='Delay'  and START_TIME>='2012-01-01' and END_TIME<='2013-01-01' and FLEET IS NOT NULL
        group by fleet order by FLEET asc  

有谁能帮我指引方向，如何做到这一点？sql新手，所以我认为应该使用临时表

谢谢

简单的内部联接应执行以下操作：

SELECT op.Fleet, (Operating / Delay) AS Calc FROM
(select 
    Fleet, SUM(hours) as Operating 
    from table
    where 
        colE = 'Operating' 
        and START_TIME >= '2012-01-01' and END_TIME<='2013-01-01' 
        and FLEET IS NOT NULL
    group by fleet 
) AS op INNER JOIN (
select Fleet, SUM(hours) as Delay
    from table
    where colE='Delay'  and START_TIME>='2012-01-01'
        and END_TIME<='2013-01-01' and FLEET IS NOT NULL
    group by fleet
) AS de ON op.Fleet = de.Fleet
ORDER BY op.Fleet ASC

---

这是更一般的，但在类似情况下可能会有所帮助

您可以像这样在声明的变量中选择值

Declare @X as Decimal, @Y as Decimal
Set @X = (Select [field] from [table] where [conditions])
Set @Y = (Select [field] from [table] where [conditions])

select @X / @Y

更具体地说，您可以使用案例陈述进行查询

SELECT
    Fleet
    ,SUM(CASE WHEN @colE = 'Operating' THEN hours END) 
    / SUM(CASE WHEN @colE = 'Delay' THEN hours END) as Calculated
FROM table
WHERE [conditions]

---

如果您的SQL引擎支持CTE的公共表表达式；e、 g.SQL SErver会，其他人也会，您可以使用以下内容：

;WITH BaseDataOperating AS 
(
select 
    Fleet, SUM(hours) as Operating 
from 
    table
where 
    colE = 'Operating' 
    and START_TIME >= '2012-01-01' and END_TIME<='2013-01-01' 
    and FLEET IS NOT NULL
group by 
    fleet 
), BaseDataDelay AS 
(
   select 
       Fleet, SUM(hours) as Delay
   from 
       table
   where 
       colE = 'Delay'
       and START_TIME >= '2012-01-01' and END_TIME <= '2013-01-01' 
       and FLEET IS NOT NULL
   group by 
       fleet 
)
SELECT 
   bdo.Fleet, 
   (bdo.Operating / bdd.Delay ) as Calculated_Col 
FROM
   BaseDataOperating bdo
INNER JOIN
   BaseDataDelay bdd ON bdo.Fleet = bdd.Fleet

---

基本上，为运行编号创建一个CTE，为延迟编号创建一个CTE，然后从这两个CTE的内部联接中进行选择最简单的方法是联接两个结果：

select a.Fleet, (Operating / Delay ) as Calculated_Col
from (select Fleet, SUM(hours) as Operating 
      from table
      where colE = 'Operating' 
      and START_TIME >= '2012-01-01'
      and END_TIME<='2013-01-01' 
      and FLEET IS NOT NULL
      group by fleet) a
join (select Fleet, SUM(hours) as Delay
      from table
      where colE='Delay'
      and START_TIME>='2012-01-01'
      and END_TIME<='2013-01-01'
      and FLEET IS NOT NULL
      group by fleet) b 
      on a.fleet = b.fleet
order by a.FLEET asc  

---

这是如何进行所要求的计算的？@Bohemian:重新阅读这个问题，我误解了。我没有看到被部分分割的部分。我已经更新了我的答案。谢谢大家，它对结果非常有效，就我所知，如果我想在混合中添加一个额外的变量statment，我会简单地添加另一个内部联接吗？我认为联接的效率比你需要的要低。您也可以通过案例陈述来实现这一点。其他人会知道得更好，但我认为db上的工作可能会更少。现在我再次查看，我开始认为CASE语句将更容易做到这一点。感谢Bohemian，如果我想在混合中添加第三个结果，我会添加另一个连接吗？例如，选择a.车队，运行/延迟1+延迟2作为计算结果\u谢谢！通过添加更多联接，我增加了额外的5个stations，并将on逻辑保留到第一个运行的舰队中。Sam，很高兴这能起作用，但请看一下使用case语句而不是多个联接。在大桌子上，您可能会看到性能上的差异。

select a.Fleet, (Operating / Delay ) as Calculated_Col
from (select Fleet, SUM(hours) as Operating 
      from table
      where colE = 'Operating' 
      and START_TIME >= '2012-01-01'
      and END_TIME<='2013-01-01' 
      and FLEET IS NOT NULL
      group by fleet) a
join (select Fleet, SUM(hours) as Delay
      from table
      where colE='Delay'
      and START_TIME>='2012-01-01'
      and END_TIME<='2013-01-01'
      and FLEET IS NOT NULL
      group by fleet) b 
      on a.fleet = b.fleet
order by a.FLEET asc