通过加入 2 个表查找丢失的记录

Question

主表

将显示所有可用 DetailsTable 的记录，Ops_Stat=A

的记录除外

+---------+----------+-------+---------+---------+---------------------+-------------------------------------------------------+
| Row_Num | Ops_Stat | RunID | Cust_ID |  Name   |    Date             |                                                       |
+---------+----------+-------+---------+---------+---------------------+-------------------------------------------------------+
|       1 | U        | A123  | AAA1111 | Hulk    | 2019-09-01 01.05.01 | < No need capture this row in expected result         |
|       2 | U        | B456  | AAA1111 | Hulk    | 2019-07-01 01.04.11 |                                                       |
|       3 | U        | C789  | AAA1111 | IronMan | 2019-05-01 01.03.01 |                                                       |
|       4 | A        | D123  | AAA1111 | Spidey  | 2019-01-01 01.02.01 | < Need capture this row and show in expected result   |
|       1 | A        | U489  | BBB2222 | Marvel  | 2019-10-10 02.02.02 | < no need get this if not match of Cust_ID in Details |
|       2 | A        | Y789  | BBB2222 | Marvel  | 2019-09-10 02.02.02 | < no need get this if not match of Cust_ID in Details |
+---------+----------+-------+---------+---------+------------+----------------------------------------------------------------+

详情

-如果字段（名称、原因和更多列）有更新，则只会在此表上显示

-只需要捕获Status='Comp'

的记录

+---------+-------+---------+---------+--------+---------------------+--------+---------------------------+
| Row_Num | RunID | Cust_ID |  Name   | Reason |    Date             | Status |                           |
+---------+-------+---------+---------+--------+---------------------+--------+---------------------------+
|       1 | A123  | AAA1111 | Hulk    |        | 2019-09-01 01.05.40 | Pend   | << Ignore status = 'Pend' |
|       2 | B456  | AAA1111 | Hulk    | A      | 2019-07-01 01.04.20 | Comp   |                           |
|       3 | C789  | AAA1111 | IronMan | A      | 2019-05-01 01.03.50 | Comp   |                           |
+---------+-------+---------+---------+--------+---------------------+--------+---------------------------+

预期结果

+----------+---------+---------+---------+--------+-------------------+--------+--------------------------------------+
| Ops_Stat | RunID   | Cust_ID |  Name   | Reason |       Date        | Status |                                      |
+----------+---------+---------+---------+--------+-------------------+--------+--------------------------------------+
| U        | B456    | AAA1111 | Hulk    | A      | 20190701 01.04.20 | Comp   | << take every field in Details table |
| U        | C789    | AAA1111 | IronMan | A      | 20190501 01.03.50 | Comp   | << take every field in Details table |
| A        | D123    | AAA1111 | Spidey  |        | 20190101 01.02.01 |        | << take every field in Master table  |
+----------+---------+---------+---------+--------+-------------------+--------+--------------------------------------+

1. Cust_ID 是连接 Master 和 Details 表的关键
2. 在预期结果中，需要包含 Ops_Stat = A 的记录；以及是否在 Master 和 Details 表中匹配 Cust_ID
3. 在预期结果中，如果Details表中没有Cust_ID匹配，则无需获取Ops_Stat=A。
4. 在预期结果中，需要排除Details table status = Pend的记录
5. 请注意日期时间。当 Ops_stat=A 时，取 MasterTable 中的 datetime，但当 Ops_stat 不等于 A 时，取 DetailsTable 中的 datetime

尝试过：

select * 
from Master m
left join Details d on m.Cust_ID = d.Cust_ID
where d.Status = 'Comp'

根据上面的尝试，我的发现如下

1. Master 表中的所有记录（无论状态 = pend 还是 com，明细表中没有匹配键，明细表中的状态都变为“Comp”而不是 Pend + Comp

您可以在这里尝试您的代码：SQL Fiddle

Answer 1

在这种情况下，我建议将结果集分成两个子查询，即

第一个结果集将取决于 Status='Comp'

select * 
from Master m
inner join Details d 
on m.Cust_ID = d.Cust_ID
where d.Status = 'Comp'

第二个结果集仅包含来自 MasterTable 的数据

select * 
from Master m 
left join Details d 
on m.cust_Id = d.Cust_ID 
where ops_stat='A'

编辑

要加入这两条记录，请使用 UNION ALL，

select m.RowNum, m.Ops_Stat, m.RunID, m.Cust_ID, m.Name, m.DateTime, 
d.RowNum, d.RunID, d.Cust_ID, d.Name, d.Reason, d.DateTime, d.Status
from m
inner join d 
on m.Cust_ID = d.Cust_ID and m.runId=d.runId
where d.Status = 'Comp'

UNION ALL

select m.RowNum, m.Ops_Stat, m.RunID, m.Cust_ID, m.Name, m.DateTime, 
d.RowNum, d.RunID, d.Cust_ID, d.Name, d.Reason, d.DateTime, ISNULL(d.Status,'COMP') 
from m 
left join d 
on m.cust_Id = d.Cust_ID and m.runId=d.runId
where ops_stat='A'

或者您可以将记录插入第三个临时表，我不建议这样做，因为它会花费插入操作。

SQL fiddle 上的结果集是 OUTPUT

Answer 2

请尝试下面的代码。

选择 m.Ops_stat,m.RunID,m.Cust_ID,m.Name,d.Reason,case when isnull(d.status,'') = '' then m.Date else d.date end ddate,d 。状态 来自大师 m left join 详细信息 d on m.Cust_ID = d.Cust_ID AND m.RunID = d.RunID 其中 ISNULL(d.Status,'') '挂起'