Question

我有3个选择查询：

查询1：

select MMBID, MMBStartDate, MMBEnddate from MMBT1, MMBT2
where MMBT1.Profile_ID = MMBT2.Profile_ID

查询2：

(SELECT Profile_ID, COUNT(vp.Viewed_ProfileId) AS viewed FROM dbo.Viewed_Profiles vp
  GROUP BY vp.Profile_Id),

查询3：

SELECT Profile_ID, COUNT(fp.Favorite_ProfileId) AS favorites FROM dbo.Favorite_Profiles fp
  GROUP BY fp.Profile_Id

现在我如何组合所有这3个选择的sts并将以下列作为输出

：MMBID, MMBStartDate, MMBEnddate
来自query2：COUNT(vp.Viewed_ProfileId) AS viewed
：COUNT(fp.Favorite_ProfileId) AS favorites

感谢您的帮助太阳

  (SELECT Profile_ID, COUNT(vp.Viewed_ProfileId) AS viewed FROM dbo.Viewed_Profiles vp
  GROUP BY vp.Profile_Id),
  (SELECT Profile_ID, COUNT(fp.Favorite_ProfileId) AS favorites FROM dbo.Favorite_Profiles fp
  GROUP BY fp.Profile_Id
   )

Answer 1

with one as 
(select MMBID, MMBStartDate, MMBEnddate, MMBT1.Profile_ID 
from MMBT1, MMBT2 where MMBT1.Profile_ID = MMBT2.Profile_ID),
two as
(SELECT Profile_ID, COUNT(vp.Viewed_ProfileId) AS viewed 
FROM dbo.Viewed_Profiles vp  GROUP BY vp.Profile_Id),
three as
(SELECT Profile_ID, COUNT(fp.Favorite_ProfileId) AS favorites 
FROM dbo.Favorite_Profiles fp  GROUP BY fp.Profile_Id)

select one.MMBID, one.MMBStartDate, one.MMBEndDate, two.viewed, three.favorites
from one inner join two on one.Profile_ID = two.Profile_ID
inner join  three on two.Profile_ID=three.profile_ID

Answer 2

SELECT
  MMBID,
  MMBStartDate,
  MMBEnddate,
  vp.viewed,
  fp.favorites
FROM MMBT1
  INNER JOIN MMBT2 ON MMBT1.Profile_ID = MMBT2.Profile_ID

  INNER JOIN (
    SELECT
      Profile_ID,
      COUNT(Viewed_ProfileId) AS viewed
    FROM dbo.Viewed_Profiles
    GROUP BY Profile_ID
  ) vp ON MMBT1.Profile_ID = vp.Profile_ID

  INNER JOIN (
    SELECT
      Profile_ID,
      COUNT(Favorite_ProfileId) AS favorites
    FROM dbo.Favorite_Profiles
    GROUP BY Profile_ID
  ) fp ON MMBT1.Profile_ID = fp.Profile_ID

如果某些MMBT1.Profile_ID值在vp或fp子选择中没有匹配项，则相应的行将不会包含在结果集中。如果这是不可取的，并且您希望MMBT1＆amp;的联接中的所有行保留MMBT2，使用LEFT JOIN：

SELECT
  MMBID,
  MMBStartDate,
  MMBEnddate,
  COALESCE(vp.viewed, 0) AS viewed,
  COALESCE(fp.favorites, 0) AS favorites
FROM MMBT1
  INNER JOIN MMBT2 ON MMBT1.Profile_ID = MMBT2.Profile_ID

  LEFT JOIN (
    SELECT
      Profile_ID,
      COUNT(Viewed_ProfileId) AS viewed
    FROM dbo.Viewed_Profiles
    GROUP BY Profile_ID
  ) vp ON MMBT1.Profile_ID = vp.Profile_ID

  LEFT JOIN (
    SELECT
      Profile_ID,
      COUNT(Favorite_ProfileId) AS favorites
    FROM dbo.Favorite_Profiles
    GROUP BY Profile_ID
  ) fp ON MMBT1.Profile_ID = fp.Profile_ID

Answer 3

如果我理解你的问题，请尝试这样的事情：

select t1.Profile_ID, t1.MMBID, t1.MMBStartDate, t1.MMBEndDate,
t2.viewed as ProfileViews, t3.viewed as FavoriteViews
FROM
(
Select MMBT1.Profile_ID, MMBID, MMBStartDate, MMBEndDate from MMBT1, MMBT2 where MMBT1.Profile_ID = MMBT2.Profile_ID
)t1
inner join
(
SELECT Profile_ID, COUNT(vp.Viewed_ProfileId) AS viewed FROM dbo.Viewed_Profiles vp GROUP BY vp.Profile_Id
)t2 on t1.Profile_ID = t2.Profile_ID
inner join
(
SELECT Profile_ID, COUNT(fp.Favorite_ProfileId) AS favorites FROM dbo.Favorite_Profiles fp
 GROUP BY fp.Profile_Id
)t3 on t1.Profile_ID = t3.Profile_ID

将选择查询与count（*），group by组合在一起

3 个答案: