Question

我正在尝试编写一个查询，它允许我在两个不同的连接中获取列的总和，但这两个连接将具有不同的条件。例如，我想从不同表中的记录中总结“matter_TotalBilled”，但我希望能够控制日期范围。所以下面我有这个问题：

SELECT  
SUM(MattersThisYear.matter_TotalBilled) AS mattersThisYear, 
SUM(MattersLastYear.matter_TotalBilled) AS mattersLastYear 

FROM sys_Team 

LEFT JOIN (
SELECT matter_TotalBilled, matter_TeamID, matter_DateOpened 
FROM Company 
LEFT JOIN ClientRelationship ON 
ClientRelationship.clientrelationship_RelatedToItemID = Company.company_ID 
AND ClientRelationship.clientrelationship_SOSRelFile = 'OR' 
INNER JOIN Matter ON 
Matter.matter_ClientID = ClientRelationship.clientrelationship_ClientID 
GROUP BY matter_ID) AS MattersThisYear ON 
MattersThisYear.matter_TeamID = sys_Team.team_ID 
AND MattersThisYear.matter_DateOpened >= '2016-10-1' 
AND MattersThisYear.matter_DateOpened <= '2017-7-26' 

LEFT JOIN (
SELECT matter_TotalBilled, matter_TeamID, matter_DateOpened 
FROM Company 
LEFT JOIN ClientRelationship ON 
ClientRelationship.clientrelationship_RelatedToItemID = Company.company_ID 
AND ClientRelationship.clientrelationship_SOSRelFile = 'OR' 
INNER JOIN Matter ON 
Matter.matter_ClientID = ClientRelationship.clientrelationship_ClientID 
GROUP BY matter_ID) AS MattersLastYear ON 
MattersLastYear.matter_TeamID = sys_Team.team_ID 
AND MattersLastYear.matter_DateOpened >= '2015-10-1' 
AND MattersLastYear.matter_DateOpened <= '2016-7-26' 

GROUP BY team_ID

这里有两个连接。一个是“2016-10-1”和“2017-7-26”（MattersThisYear）之间的“Matter”行，另一个是“2015-10-1”和“2016-7”之间的“Matter”行26“（MattersLastYear）。

只要我只有“MattersThisYear”连接，此查询就可以工作，但只要我包含“MattersLastYear”连接，“SUM（MattersThisYear.matter_TotalBilled）”就会更改，即使这只是引用“MattersThisYear”加入。

我的意图是，对于每个团队，我想要返回今年和去年的事项_TotalBilled总和。

我需要在查询中更改哪些内容才能解决此问题？

更新1：

这是我运行以下查询时得到的输出：

SELECT team_Name, 
SUM(MattersThisYear.mattersThisYear) AS mattersThisYear, 
SUM(MattersLastYear.mattersLastYear) AS mattersLastYear 
FROM sys_Team 
LEFT JOIN 
(
    SELECT matter_TotalBilled as mattersThisYear,0 as mattersLastYear, matter_TeamID, matter_DateOpened -- made change at this line
    FROM Company 
    LEFT JOIN ClientRelationship ON 
    ClientRelationship.clientrelationship_RelatedToItemID = Company.company_ID 
    AND ClientRelationship.clientrelationship_SOSRelFile = 'OR' 
    INNER JOIN Matter ON 
    Matter.matter_ClientID = ClientRelationship.clientrelationship_ClientID 
    GROUP BY matter_ID
) AS MattersThisYear ON MattersThisYear.matter_TeamID = sys_Team.team_ID 
AND MattersThisYear.matter_DateOpened >= '2016-10-1' 
AND MattersThisYear.matter_DateOpened <= '2017-7-26' 
LEFT JOIN 
(
    SELECT 0 as mattersThisYear,matter_TotalBilled as mattersLastYear, matter_TeamID, matter_DateOpened  -- made change at this line
    FROM Company 
    LEFT JOIN ClientRelationship ON 
    ClientRelationship.clientrelationship_RelatedToItemID = Company.company_ID 
    AND ClientRelationship.clientrelationship_SOSRelFile = 'OR' 
    INNER JOIN Matter ON 
    Matter.matter_ClientID = ClientRelationship.clientrelationship_ClientID 
    GROUP BY matter_ID
) AS MattersLastYear ON MattersLastYear.matter_TeamID = sys_Team.team_ID 
AND MattersLastYear.matter_DateOpened >= '2015-10-1' 
AND MattersLastYear.matter_DateOpened <= '2016-7-26' 

GROUP BY team_ID

作为一个例子，看着名为“商业诉讼”的团队，“mattersThisYear”的价值是“16261750”。

当我运行此查询时：

SELECT team_Name, 
SUM(MattersThisYear.mattersThisYear) AS mattersThisYear 
#SUM(MattersLastYear.mattersLastYear) AS mattersLastYear 
FROM sys_Team 
LEFT JOIN 
(
    SELECT matter_TotalBilled as mattersThisYear,0 as mattersLastYear, matter_TeamID, matter_DateOpened -- made change at this line
    FROM Company 
    LEFT JOIN ClientRelationship ON 
    ClientRelationship.clientrelationship_RelatedToItemID = Company.company_ID 
    AND ClientRelationship.clientrelationship_SOSRelFile = 'OR' 
    INNER JOIN Matter ON 
    Matter.matter_ClientID = ClientRelationship.clientrelationship_ClientID 
    GROUP BY matter_ID
) AS MattersThisYear ON MattersThisYear.matter_TeamID = sys_Team.team_ID 
AND MattersThisYear.matter_DateOpened >= '2016-10-1' 
AND MattersThisYear.matter_DateOpened <= '2017-7-26' 
#LEFT JOIN 
#(
#    SELECT 0 as mattersThisYear,matter_TotalBilled as mattersLastYear, matter_TeamID, matter_DateOpened  -- made change at this line
#    FROM Company 
#    LEFT JOIN ClientRelationship ON 
#    ClientRelationship.clientrelationship_RelatedToItemID = Company.company_ID 
#    AND ClientRelationship.clientrelationship_SOSRelFile = 'OR' 
#    INNER JOIN Matter ON 
#    Matter.matter_ClientID = ClientRelationship.clientrelationship_ClientID 
#    GROUP BY matter_ID
#) AS MattersLastYear ON MattersLastYear.matter_TeamID = sys_Team.team_ID 
#AND MattersLastYear.matter_DateOpened >= '2015-10-1' 
#AND MattersLastYear.matter_DateOpened <= '2016-7-26' 

GROUP BY team_ID

然后这个值就变成了我期望的值，即“130094”。

Answer 1

SELECT  
SUM(MattersThisYear.mattersThisYear) AS mattersThisYear, 
SUM(MattersLastYear.mattersLastYear) AS mattersLastYear 
FROM sys_Team 
LEFT JOIN 
(
    SELECT matter_TotalBilled as mattersThisYear,0 as mattersLastYear, matter_TeamID, matter_DateOpened -- made change at this line
    FROM Company 
    LEFT JOIN ClientRelationship ON 
    ClientRelationship.clientrelationship_RelatedToItemID = Company.company_ID 
    AND ClientRelationship.clientrelationship_SOSRelFile = 'OR' 
    INNER JOIN Matter ON 
    Matter.matter_ClientID = ClientRelationship.clientrelationship_ClientID
WHERE  matter_DateOpened >= '2016-10-1' 
AND matter_DateOpened <= '2017-7-26' 


    GROUP BY matter_ID
) AS MattersThisYear ON MattersThisYear.matter_TeamID = sys_Team.team_ID 

LEFT JOIN 
(
    SELECT 0 as mattersThisYear,matter_TotalBilled as mattersLastYear, matter_TeamID, matter_DateOpened  -- made change at this line
    FROM Company 
    LEFT JOIN ClientRelationship ON 
    ClientRelationship.clientrelationship_RelatedToItemID = Company.company_ID 
    AND ClientRelationship.clientrelationship_SOSRelFile = 'OR' 
    INNER JOIN Matter ON 
    Matter.matter_ClientID = ClientRelationship.clientrelationship_ClientID 
    WHERE  matter_DateOpened >= '2015-10-1' 
AND matter_DateOpened <= '2016-7-26' 

    GROUP BY matter_ID
) AS MattersLastYear ON MattersLastYear.matter_TeamID = sys_Team.team_ID 

GROUP BY team_ID

尝试以上查询。

Answer 2

由于您尝试将相同的列名称放在两个联接中，我认为您可能希望在加入之前将它们合并在一起。

SELECT team_Name, 
SUM(MattersBothYears.mattersThisYear) AS mattersThisYear, 
SUM(MattersBothYears.mattersLastYear) AS mattersLastYear 
FROM sys_Team 
LEFT JOIN (
(
    SELECT matter_TotalBilled as mattersThisYear,0 as mattersLastYear, matter_TeamID, matter_DateOpened
    FROM Company 
    LEFT JOIN ClientRelationship ON 
    ClientRelationship.clientrelationship_RelatedToItemID = Company.company_ID 
    AND ClientRelationship.clientrelationship_SOSRelFile = 'OR' 
    INNER JOIN Matter ON 
    Matter.matter_ClientID = ClientRelationship.clientrelationship_ClientID 
    AND Matter.matter_DateOpened >= '2016-10-1' 
    AND Matter.matter_DateOpened <= '2017-7-26' 
    GROUP BY matter_ID
) 
UNION ALL
(
    SELECT 0 as mattersThisYear,matter_TotalBilled as mattersLastYear, matter_TeamID, matter_DateOpened
    FROM Company 
    LEFT JOIN ClientRelationship ON 
    ClientRelationship.clientrelationship_RelatedToItemID = Company.company_ID 
    AND ClientRelationship.clientrelationship_SOSRelFile = 'OR' 
    INNER JOIN Matter ON 
    Matter.matter_ClientID = ClientRelationship.clientrelationship_ClientID 
    AND Matter.matter_DateOpened >= '2015-10-1' 
    AND Matter.matter_DateOpened <= '2016-7-26' 
    GROUP BY matter_ID
) 
) MattersBothYears ON MattersBothYears.matter_TeamID = sys_Team.team_ID 
GROUP BY team_ID

Answer 3

您加入查询的方式不正确。当您首先使用MattersThisYear子查询加入sys_Team时。可能有多个matter_TeamID，如果你加入MattersLastYear子查询，那么你可能会得到错误的结果。

例如：当您单独执行这些查询时，您将获得以下数据。

Table: sys_Team
Teamid 
1

MattersThisYear子查询

matter_TotalBilled, matter_TeamID, matter_DateOpened
100               , 1            , '2016-10-1' 
100               , 1            , '2017-7-26'

MattersLastYear子查询

matter_TotalBilled, matter_TeamID, matter_DateOpened
50                , 1            , '2015-10-1' 
50                , 1            , '2016-7-26'

现在你基于team_id加入sys_Team和MattersThisYear。

首次加入后的输出：

team_ID, matter_TotalBilled   , matter_TeamID , matter_DateOpened
1      , 100                  , 1             , '2016-10-1' 
1      , 100                  , 1             , '2017-7-26'

现在，上面的结果集用于连接MattersLastYear子查询的结果集。

加入后，您将获得以下结果。

team_ID, matter_TotalBilled   , matter_TeamID , matter_DateOpened, matter_TotalBilled , matter_DateOpened
1      , 100                  , 1             , '2016-10-1'      , 50                 , '2015-10-01'
1      , 100                  , 1             , '2017-7-26'      , 50                 , '2015-10-01'
1      , 100                  , 1             , '2016-10-1'      , 50                 , '2016-7-26'
1      , 100                  , 1             , '2017-7-26'      , 50                 , '2016-7-26'

你总结它然后你会得到错误的结果。

建议您的查询。我假设sys_team没有两次相同的团队ID。

1）在子查询中使用日期过滤器。它也可以提高你的表现。 2）一旦在子查询中包含了matter_DateOpened，就可以从子查询中删除matter_DateOpened。 3）求和mattere_totalBilled并按team_ID使用group 4）对于两个子查询，执行1,2和3。 5）现在加入吧。

使用两个具有不同条件的左连接修复SQL

3 个答案: