从表中删除重复的行和引用的表microsoft sql server

Question

我有桌子人：

PersonId     | FirstName   | LastName |
1            | 'John'      | 'Doe'    |
2            | 'Mike'      | 'Test'   |
3            | 'John'      | 'Doe'    |
4            | 'Mike'      | 'Test'   |
5            | 'John'      | 'Doe'    |
6            | 'John'      | 'Doe'    |

餐桌顾客：

CustomerId      | PersonId    |
1001            | 1           | 
1002            | 2           |
1003            | 3           |
1004            | 4           |
1005            | 5           |
1006            | 6           |

我想删除客户 1003,1004,1005,1006，因为他们的 Person 重复，但 PersonId 不一样。

这应该检查 Person 表中的 FirstName 和 LastName 并删除 Customer 表中的重复项，然后删除 Person 表中的重复项。 (3,4,5,6)

很抱歉，如果以前有人问过类似的问题，但我不能这样做。

Answer 1

使用此查询查看重复项：

 with duplicatecte(personid,rownum)As
 (
    select personid ,
           row_Number() over(partition by FirstName+LastName order by personid) 
    from #person
   )
   select b.personid,customerid from duplicatecte a
   inner join #customer b on a.personid=b.personid where rownum>1

修改此查询以删除如下

 with duplicatecte(personid,rownum)As
 (
  select personid ,
        row_Number() over(partition by FirstName+LastName order by personid) 
  from #person
  )
 delete b
 from duplicatecte a
 inner join #customer b on a.personid=b.personid where rownum>1

Answer 2

检查一下。

我们首先从客户表中删除。首先，我们通过使用 Row_number() 找到重复记录并删除必须排名超过 1 的 personid。

以下查询显示重复记录：

    select ROW_NUMBER () over ( partition by firstname,lastname order by 
    PersonId ) RID, PersonId,FirstName,LastName 
    from #Person  

找到重复项后，我们将其从客户表中删除，然后从人员中删除。

        delete from Customer where PersonId in 
        ( 
        select distinct PersonId P from 
        ( select ROW_NUMBER () over ( partition by firstname,lastname order by PersonId ) RID, PersonId,FirstName,LastName from #Person )a
        where RID>1
        )

        delete from Person where PersonId in 
        ( 
        select distinct PersonId P from 
        ( select ROW_NUMBER () over ( partition by firstname,lastname order by PersonId ) RID, PersonId,FirstName,LastName from #Person )a
        where RID>1
        )

Answer 3

Begin Tran

CREATE TABLE #Person(PersonId INT,FirstName NVARCHAR(50),LastName NVARCHAR(50))
CREATE TABLE #Customer (CustomerId INT,PersonId INT)

INSERT INTO #Person
SELECT 1,'John','Doe'     UNION ALL
SELECT 2 ,'Mike','Test'   UNION ALL
SELECT 3 ,'John','Doe'    UNION ALL
SELECT 4 ,'Mike','Test'   UNION ALL
SELECT 5 ,'John','Doe'    UNION ALL
SELECT 6 ,'John','Doe'    


INSERT INTO #Customer
SELECT 1001, 1     UNION ALL      
SELECT 1002 ,2   UNION ALL        
SELECT 1003 ,3    UNION ALL      
SELECT 1004 ,4    UNION ALL       
SELECT 1005,5      UNION ALL     
SELECT 1006,6           

GO
WITH CTE (PersonId, DuplicateCount)
AS
(
    SELECT FirstName,
    ROW_NUMBER() OVER(PARTITION BY  FirstName,LastName ORDER BY  FirstName,PersonId) AS DuplicateCount
    FROM #Person
)
--Select * from CTE WHERE DuplicateCount>1
DELETE FROM CTE WHERE DuplicateCount >1
DELETE FROM #Customer WHERE PersonId NOT IN(SELECT PersonId FROM #Person)


Select * from #Person
SELECT * from #Customer

ROLLBACK TRAN

Answer 4

declare @tbl table 
(pid int
)
;with cte
as
(
select t1.*,row_number() over (partition by firstname,lastname order by personid) as rownum
from
person t1
)

delete 
from
 cte
 output deleted.personid  into @tbl where rownum>1


 delete from customer where personid in (select personid from @tbl)

Answer 5

这对你有用：

Declare @person As table
(
 PersonId int,
 FirstName varchar(25),
 LastName varchar(25)
)

Declare @customer As table
(
 CustomerId int,
 PersonId int
)


Insert Into @person (PersonId,FirstName,LastName) values(1,'John','Doe')
Insert Into @person (PersonId,FirstName,LastName) values(2,'Mike','Test')
Insert Into @person (PersonId,FirstName,LastName) values(3,'John','Doe')
Insert Into @person (PersonId,FirstName,LastName) values(4,'Mike','Test')
Insert Into @person (PersonId,FirstName,LastName) values(5,'John','Doe')
Insert Into @person (PersonId,FirstName,LastName) values(6,'John','Doe')
Insert Into @customer(CustomerId,PersonId) values(1001,1)
Insert Into @customer(CustomerId,PersonId) values(1002,2)
Insert Into @customer(CustomerId,PersonId) values(1003,3)
Insert Into @customer(CustomerId,PersonId) values(1004,4)
Insert Into @customer(CustomerId,PersonId) values(1005,5)
Insert Into @customer(CustomerId,PersonId) values(1006,6)


select p.PersonId into #temp from @person p right join 
(Select PersonId,FirstName,LastName, ROW_NUMBER() over (partition by FirstName,LastName Order by PersonId) rownumber 
from @person ) a
on p.PersonId=a.PersonId where a.rownumber>1

delete from @customer where PersonId in (select PersonId from #temp)
delete from @person where PersonId in (select PersonId from #temp)


select *from @customer
select *from @person