跨多個表匹配值

Question

我有一個帶有6個表的SQL Server數據庫。

這些表格中有一種客戶名稱。

• 在表一：用的名字，姓
• 在表二：名字，第二個名字
• 在表三：姓，姓

等等等等橫跨6張桌子。

我所試圖做的就是有多少次的計數：

• 全名（姓和名的CONCAT）對所有的表出現。
• 全名（姓氏和名字的CONCAT）跨越5個表
• 全名（姓氏和名字的CONCAT）出現出現跨越4個表 等等等等
• 全名（初的CONCAT和姓氏）​​只出現在表1中

在SQL中有沒有一種簡單的方法來做這種類型的事？

謝謝

Answer 1

我想你想一個union all和group by。以下幾點比你要求的要多一點。它返回名稱在每個表中出現的次數。

您可以輕鬆地把它簡化爲只表計，如果你喜歡：

select t1, t2, t3, t4, t5, t6, count(*) as cnt, 
     min(fullname), max(fullname) 
from (select fullname, 
      sum(t1) as t1, sum(t2) as t2, sum(t3) as t3, sum(t4) as t4, 
      sum(t5) as t5, sum(t6) as t6 
     from ((select firstname + ' ' + lastname as fullname, 
        1 as t1, 0 as t2, 0 as t3, 0 as t4, 0 as t5, 0 as t6 
      from t1 
      ) union all 
      (select firstname + ' ' + lastname as fullname, 
        0 as t1, 1 as t2, 0 as t3, 0 as t4, 0 as t5, 0 as t6 
      from t2 
      ) union all 
      . . . 
      ) t 
     group by fullname 
    ) f 
group by t1, t2, t3, t4, t5, t6; 

Answer 2

也許是這樣的。

Select Name 
     ,Hits=count(*) 
     ,Tables = count(distinct Src) 
From (
     Select Src='Table1',Name=concat(FirstName,LastName) From Table1 
     Union All 
     Select Src='Table2',Name=concat(Foreame,SurName) From Table2 
     Union All 
     Select Src='Table3',Name=concat(FirstName,SurName) From Table3 
     Union All 
     ... Add more tables here 
    ) A 
Group By Name 
Having count(*)>1 

編輯 - 工作樣品或dbFiddle

Declare @Table1 table (FirstName varchar(50),LastName varchar(50)) 
Insert Into @Table1 values 
('John','Smith') 
,('Mary','Smith') 

Declare @Table2 table (ForeName varchar(50),SurName varchar(50)) 
Insert Into @Table2 values 
('John','Smith') 
,('Mary-Ann','Jenson') 


Select Name 
     ,Hits=count(*) 
     ,Tables = count(distinct Src) 
From (
     Select Src='Table1',Name=concat(FirstName,LastName) From @Table1 
     Union All 
     Select Src='Table2',Name=concat(ForeName,SurName) From @Table2 
    ) A 
Group By Name 
Having count(*)>1 

返回

Name  Hits Tables 
JohnSmith 2  2