所以....我们有三个不同的表,它们与比赛有关,数据库在其中跟踪他们在每次比赛中获得的分数。比赛 1、2 和 3。每次用户取得成就时,都会为该用户创建一个新行,其中包含额外的分数。因此,为了计算用户收到的所有积分,我使用了一个选择总和
SELECT userID, SUM(amount1) as "Contest 1 Points"
FROM [Company].[dbo].[Contest1]
WHERE userid not in (0,1)
GROUP BY userId
ORDER BY userid
因为我还有两场比赛,所以我也对每场比赛都进行了查询...
SELECT userId, SUM(amount2)/.65 AS "Category 2 Points"
FROM [Company].[dbo].[Contest2]
WHERE dateGiven >=201301 AND dateGiven <= 201305
GROUP BY userId
ORDER BY userid
SELECT userid, SUM(amount3) AS "Category 3 Points"
FROM [Company].[dbo].[Contest3]
where userid not in (1,2)
GROUP BY userid
ORDER BY userid
我基本上需要将每个用户从每次比赛中获得的所有积分加到 1 列中,基本上显示结果 USERID,TOTAL OF TOTALS(Contest1 + Contest2 + Contest3)
或者至少让它喜欢,
USER,比赛 1 总计,比赛 2 总计,比赛 3 总计
到目前为止,我这样做的方法是将这些结果中的每一个复制/粘贴到 excel 中,然后我使用 VLOOKUP 将它们相互匹配,这有点麻烦,我相信有一种方法可以在 SQL 中做到这一点。我是 SQL 的新手,我尝试加入并使用 ON 来匹配用户 ID,但我的语法有问题,我理解它全部插入自身以进行查询。
最佳答案
您需要对结果进行 UNION:
SELECT userID, SUM(Points) AS total
FROM
(
SELECT userID, SUM(amount1) AS "Points"
FROM [Company].[dbo].[Contest1]
WHERE userid NOT IN (0,1)
GROUP BY userId
UNION ALL
SELECT userId, SUM(amount2)/.65 AS "Category 2 Points"
FROM [Company].[dbo].[Contest2]
WHERE dateGiven >=201301 AND dateGiven <= 201305
GROUP BY userId
UNION ALL
SELECT userid, SUM(amount3) AS "Category 3 Points"
FROM [Company].[dbo].[Contest3]
WHERE userid NOT IN (1,2)
GROUP BY userid
) AS dt
GROUP BY userID
ORDER BY 2 DESC;
编辑: 要获得三个单独的列,您只需使用三个 SUM 而不是一个:
SELECT userID, SUM("Category 1 Points"), SUM("Category 2 Points"), SUM("Category 3 Points")
FROM
(
SELECT userID, SUM(amount1) AS "Category 1 Points"
FROM [Company].[dbo].[Contest1]
WHERE userid NOT IN (0,1)
GROUP BY userId
UNION ALL
SELECT userId, SUM(amount2)/.65 AS "Category 2 Points"
FROM [Company].[dbo].[Contest2]
WHERE dateGiven >=201301 AND dateGiven <= 201305
GROUP BY userId
UNION ALL
SELECT userid, SUM(amount3) AS "Category 3 Points"
FROM [Company].[dbo].[Contest3]
WHERE userid NOT IN (1,2)
GROUP BY userid
) AS dt
GROUP BY userID
ORDER BY 2 DESC;
当然,每个 userDI/类别只有一行,因此 MIN 或 MAX 会返回相同的结果。 这将为不存在的数据返回 NULL,如果您想要 0 而不是使用 COALESCE("Category x Points", 0)。
您也可以加入结果集,但除非保证每个用户都参加了每次比赛,否则您需要使用 COALESCE 的 FULL OUTER JOIN:
SELECT userID, "Category 1 Points", "Category 2 Points", "Category 3 Points"
FROM
(
SELECT userID, SUM(amount1) AS "Category 1 Points"
FROM [Company].[dbo].[Contest1]
WHERE userid NOT IN (0,1)
GROUP BY userId
) AS t1
FULL JOIN
ON t1.userID = t2.userID
(
SELECT userId, SUM(amount2)/.65 AS "Category 2 Points"
FROM [Company].[dbo].[Contest2]
WHERE dateGiven >=201301 AND dateGiven <= 201305
GROUP BY userId
) AS t2
FULL JOIN
(
SELECT userid, SUM(amount3) AS "Category 3 Points"
FROM [Company].[dbo].[Contest3]
WHERE userid NOT IN (1,2)
GROUP BY userid
) AS t3
ON COALESCE(t1.userID, t2.userID) = t3.userID
ORDER BY 2 DESC;
关于mysql - 将 SUM 的多个查询合并为一个结果,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/18860489/