如何从两个表创建第三个表？

Question

我有两张很棒的桌子，我想用它作为更大的第三张桌子的基础！

输出取决于日期间隔，如09/01/2010 - 09/03/2010

来自表A <的输出示例 - - （已分配测试人员）

Date            Country        Allocated testers
09/01/2010      Nigeria           0
09/02/2010      Nigeria           1
09/03/2010      Nigeria         134

09/01/2010      China             2
09/02/2010      China             0
09/03/2010      China            14

09/01/2010      Chile             3
09/02/2010      Chile             4
09/03/2010      Chile             0

*************

来自表B 的输出示例 - - （缺席测试人员）

Date            Country        Absent testers
09/01/2010      Nigeria           0
09/02/2010      Nigeria           7
09/03/2010      Nigeria           0

09/01/2010      China             2
09/02/2010      China             0
09/03/2010      China             0

09/01/2010      Chile             1
09/02/2010      Chile             0
09/03/2010      Chile             0

*************

表C中的WANTED输出示例（已分配和未分配的测试人员）

Date            Country        Allocated testers    Absent testers
09/01/2010      Nigeria           0                 0
09/02/2010      Nigeria           1                 7
09/03/2010      Nigeria         134                 0

09/01/2010      China             2                 2
09/02/2010      China             0                 0
09/03/2010      China            14                 0

09/01/2010      Chile             3                 2
09/02/2010      Chile             4                 0
09/03/2010      Chile             0                 0

这里有一些SQL代码生成上面显示的输出......（是的，它们可以工作）

表A

WITH Calendar AS (SELECT     CAST(@StartDate AS datetime) AS Date
     UNION ALL
     SELECT     DATEADD(d, 1, Date) AS Expr1
     FROM         Calendar AS Calendar_1
     WHERE     (DATEADD(d, 1, Date) < @EndDate))
    SELECT     C.Date, C2.Country, COALESCE (SUM(R.[Amount of people per day needed]), 0) AS [Allocated testers]
     FROM         Calendar AS C CROSS JOIN
                            Country AS C2 LEFT OUTER JOIN
                            Requests AS R ON C.Date BETWEEN R.[Start date] AND R.[End date] AND R.CountryID = C2.CountryID
     GROUP BY C.Date, C2.Country OPTION (MAXRECURSION 0)

表B

WITH Calendar AS (SELECT     CAST(@StartDate AS datetime) AS Date
     UNION ALL
     SELECT     DATEADD(d, 1, Date) AS Expr1
     FROM         Calendar AS Calendar_1
     WHERE     (DATEADD(d, 1, Date) < @EndDate))
    SELECT     C.Date, C2.Country, COALESCE (COUNT(PA.PeopleID), 0) AS [Absent testers]
     FROM         Calendar AS C CROSS JOIN
                            Country AS C2 INNER JOIN
                            Roles AS R INNER JOIN
                            People AS P ON R.RolesID = P.RolesID ON C2.CountryID = P.CountryID LEFT OUTER JOIN
                            PeoplesAbsence AS PA ON C.Date BETWEEN PA.StartDate AND PA.EndDate AND P.PeopleID = PA.PeopleID
     WHERE     (R.Role = 'Tester')
     GROUP BY C.Date, C2.Country OPTION (MAXRECURSION 0)

表C 是我需要帮助创建的： - ）

注意：我想看一些示例代码，开始使用！

另请注意：我不想用SQL Server中的Views解决这个问题，因为它无法工作...... - 我需要3：rd表; - ）

---

已解决！从 tdammers 获得解决方案（谢谢！），这就是实施时的样子：

WITH Calendar AS (SELECT     CAST(@StartDate AS datetime) AS Date
UNION ALL
SELECT
    DATEADD(d, 1, Date) AS Expr1
FROM
    Calendar AS Calendar_1
WHERE
    (DATEADD(d, 1, Date) < @EndDate))


SELECT a.Date, a.Country, a.[Allocated testers], b.[Absent testers] FROM ( SELECT
    C.Date, C2.Country, COALESCE (SUM(R.[Amount of people per day needed]), 0) AS [Allocated testers]
FROM
    Calendar AS C
CROSS JOIN
    Country AS C2
LEFT OUTER JOIN
    Requests AS R 
    ON
        C.Date BETWEEN R.[Start date] AND R.[End date] AND R.CountryID = C2.CountryID
GROUP BY
    C.Date, C2.Country ) as a LEFT OUTER JOIN ( SELECT     C.Date, C2.Country, COALESCE (COUNT(PA.PeopleID), 0) AS [Absent testers]
     FROM         Calendar AS C CROSS JOIN
                            Country AS C2 INNER JOIN
                            Roles AS R INNER JOIN
                            People AS P ON R.RolesID = P.RolesID ON C2.CountryID = P.CountryID LEFT OUTER JOIN
                            PeoplesAbsence AS PA ON C.Date BETWEEN PA.StartDate AND PA.EndDate AND P.PeopleID = PA.PeopleID
     WHERE     (R.Role = 'Tester')
     GROUP BY C.Date, C2.Country ) as b ON a.date = b.date AND a.country = b.country

Answer 1

表C不应该是表格，而是视图。