在 SQL 服务器中加入 tables 并报告主 table 中丢失的数据

Question

我有 4 个 table，我想将主 table 中不存在的所有数据分组。

例如我有以下 4 tables:

Table_A – 3000 行：

Table_B – 200 行：

Table_C – 150 行：

Table_D – 800 行：

我想查看 Table_A 中不存在的所有用户并将它们合并为一个 table（示例如下所示）：

我有这个查询，但是我没有得到上面想要的结果。你能告诉我哪里错了吗？

SELECT *
FROM Table_A A
RIGHT OUTER JOIN Table_B B ON A.Phone_Number = B.Phone_Number
RIGHT OUTER JOIN Table_C C ON A.Phone_Number = C.Phone_Number
RIGHT OUTER JOIN Table_C D ON A.Phone_Number = D.Phone_Number
WHERE A.ID IS NULL

Answer 1

你可以这样做。我可以看到如果水平显示数据，您将如何获得更多知识，并且以后很难使用：

Select * from 
(
  select [Employee Name], Phone_Number From table_B
  union
  select [Employee Name], Phone_Number From table_C
  union
  select [Employee Name], Phone_Number From table_D

)
 T
where not exists
(select 1 from Table_A a where a.Phone_Number  = T.Phone_Number )

Answer 2

如果我没理解错的话，你想匹配 phone 个数字。如果是：

select phone_number, max(b_name), max(c_name), max(d_name)
from ((select b.phone_number, b.employee_name as b_name, null as c_name, null as d_name
       from b 
      ) union all
      (select c.phone_number, null, c.employee_name as b_name, null as d_name
       from c 
      ) union all
      (select b.phone_number, null, null, b.employee_name as b_name
       from d
      )
     ) bcd
where not exists (select 1 from a where a.phone_number = bcd.phone_number)
group by phone_number;

在 SQL 服务器中加入 tables 并报告主 table 中丢失的数据

Join tables in SQL Server and report missing data from primary table

sql

tsql

sql-server

database-design

join