Question

我有2个查询来获取总和我希望将它们组合成单个选择查询，如果可能的话，注意它们在 where 子句中有不同的字段名称。

SELECT ISNULL(SUM(Stocking_Count), 0)
FROM Fish_Stocking
WHERE fish_id = 'B2017-1' 
  AND tank_id = 'H A01' 
  AND Date_Assigned = '2017-02-02' 
  AND stocking_date <= '2017-03-28'

SELECT ISNULL(SUM(NO_FISH_SWUM_OFF), 0)
FROM Swim_Thru
WHERE Dest_fish_id = 'B2017-1' 
  AND Dest_tank_id = 'H A01' 
  AND Dest_Date_Assigned = '2017-02-02' 
  AND date_swim_thru <= '2017-03-28'

Answer 1

作为子查询

 select 
     (SELECT ISNULL(SUM(Stocking_Count),0)
    FROM Fish_Stocking
    where fish_id = 'B2017-1' and tank_id = 'H A01' and
          Date_Assigned = '2017-02-02' and stocking_date <= '2017-03-28') [Field1],

    ( SELECT ISNULL(SUM(NO_FISH_SWUM_OFF),0)
    FROM Swim_Thru
    where Dest_fish_id = 'B2017-1' and Dest_tank_id = 'H A01' and
          Dest_Date_Assigned = '2017-02-02' and date_swim_thru <= '2017-03-28') [Field2]

Answer 2

我希望您正在尝试使用UNION ALL完成此操作。

注意：我还将ISNULL(SUM(Stocking_Count),0)更改为SUM(ISNULL(Stocking_Count, 0))。

SELECT SUM(Total) AS Total FROM (
    (SELECT SUM(ISNULL(Stocking_Count, 0)) as Total
    FROM Fish_Stocking
    where fish_id = 'B2017-1' and tank_id = 'H A01' and
          Date_Assigned = '2017-02-02' and stocking_date <= '2017-03-28')

    UNION ALL

    (SELECT SUM(ISNULL(NO_FISH_SWUM_OFF, 0)) as Total
    FROM Swim_Thru
    where Dest_fish_id = 'B2017-1' and Dest_tank_id = 'H A01' and
          Dest_Date_Assigned = '2017-02-02' and date_swim_thru <= '2017-03-28')

) Net

从2个SQL查询中返回一个总和

2 个答案: