为每个左连接行匹配重复所有基表行

Question

我无法简洁地描述我需要什么，因此感谢任何编辑标题的帮助！

我有 3 张表：

1. Jobs（有JobIDPK）
2. JobsDetail（有JobIDFK和DepartmentsIDFK）
3. Departments（有DepartmentsIDPK）

Departments记录数量较少 (~10)

如果我有 10 个部门行，我需要为每条记录重复所有 10 行Jobs。不在JobsDetail作业记录中的 DepartmentID 将NULL在作业列中显示一个值。通过一条Jobs记录，典型的LEFT JOIN工作方式将按照我想要的方式进行：

Select d.Department, jobs.JobIdentifier
From    Departments d 
LEFT JOIN (Select Distinct j.JobID, j.JobIdentifier, DepartmentID, 
           From   Jobs j
           Join   JobsDetail jd on j.JobID = jd.JobID) jobs on d.DepartmentID = jobs.DepartmentID

产生以下结果：

Department  JobIdentifier
310         NULL
320         NULL
430         NULL
450         NULL
460         NULL
500         NULL
530         1000
533         1000
534         1000
535         NULL

当然，当添加另一个 Jobs 记录时，我会看到以下内容：

Department  JobIdentifier
310         2000
320         NULL
430         NULL
450         NULL
460         2000
500         NULL
530         1000
533         1000
534         1000
534         2000
535         NULL

我需要的是这样的：

Department  JobIdentifier
310         NULL
320         NULL
430         NULL
450         NULL
460         NULL
500         NULL
530         1000
533         1000
534         1000
535         NULL
310         2000
320         NULL
430         NULL
450         NULL
460         2000
500         NULL
530         NULL
533         NULL
534         2000
535         NULL

如何才能做到这一点？

以下是表中的一些测试数据：

JobID                SubPlantID  JobIdentifier                                      PartFamilyID OrderDate               OrderedBy                                          OrderQuantity DueDate                 SpecialInstructions                                                                                                                                                                                                                                              PrintDate               PrintedBy                                          StartDate               StartedBy                                          ProducedQuantity ReprintNumber CompletedDate           Location
-------------------- ----------- -------------------------------------------------- ------------ ----------------------- -------------------------------------------------- ------------- ----------------------- ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- ----------------------- -------------------------------------------------- ----------------------- -------------------------------------------------- ---------------- ------------- ----------------------- --------------------------------------------------
2                    1           1000                                               1            2012-12-21 13:20:00.000 Keith                                              1             2012-12-28 00:00:00.000                                                                                                                                                                                                                                                                 NULL                    NULL                                               2012-12-28 00:00:00.000 NULL                                               NULL             0             NULL                    NULL
3                    1           2000                                               1            2013-01-03 00:00:00.000 Jon                                                10            2013-01-10 00:00:00.000 NULL                                                                                                                                                                                                                                                             NULL                    NULL                                               NULL                    NULL                                               NULL             0             NULL                    NULL

JobsDetailID         JobID                Operation FirstStartDate          OperationQuantity OperationStatusTypeID OperationDescription                                                                                                                                                                                                                                           DepartmentID WorkCenterID UserName
-------------------- -------------------- --------- ----------------------- ----------------- --------------------- -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- ------------ ------------ --------------------------------------------------
1                    2                    10        NULL                    1                 2                     Weld                                                                                                                                                                                                                                                           1            2            keith
2                    2                    20        NULL                    1                 3                     Punch                                                                                                                                                                                                                                                          1            1            keith
3                    2                    30        NULL                    1                 2                     Form                                                                                                                                                                                                                                                           3            5            jon
4                    2                    40        NULL                    1                 3                     Paint                                                                                                                                                                                                                                                          2            4            jon
6                    2                    50        NULL                    1                 3                     Glue                                                                                                                                                                                                                                                           2            4            jwood
9                    2                    60        NULL                    1                 2                     Eat                                                                                                                                                                                                                                                            3            5            jon
10                   3                    20        NULL                    10                1                     Punch                                                                                                                                                                                                                                                          10           18           Jon Wrye
11                   3                    30        NULL                    10                0                     Form                                                                                                                                                                                                                                                           15           29           Jon Wrye
12                   3                    40        NULL                    10                0                     Weld                                                                                                                                                                                                                                                           13           24           Jon Wrye
13                   3                    10        NULL                    10                2                     Start                                                                                                                                                                                                                                                          1            1            jwrye
14                   3                    50        NULL                    10                0                     Finish                                                                                                                                                                                                                                                         1            2            jwrye

DepartmentID Department
------------ --------------------------------------------------
1            534
2            533
3            530
4            535
5            500
6            450
7            430
8            200
9            240
10           232
11           220
12           300
13           460
14           320
15           310

Answer 1

您应该从职位和部门之间的交叉联接开始，然后从那里构建查询：

Select d.Department, jobs.JobIdentifier
From    Departments d cross join
        (select distinct JobIdentifier from Jobs j) ji LEFT JOIN
        (Select Distinct j.JobID, j.JobIdentifier, DepartmentID, 
         From Jobs j Join
              JobsDetail jd
              on j.JobID = jd.JobID
        ) jobs
        on d.DepartmentID = jobs.DepartmentID and
           ji.jobidentifer = jobs.jobIDentifier

我对 JobId 和 JobIdentifier 之间的区别有点不清楚，所以这可能不太正确。

如果将 ji.JobIdentifier 添加到列表中，即使没有匹配项，select您也会看到该部门应属于哪个职位。