SQL Server - Merging one record to another and changing items referencing the first item to reference the...
I have a duplicate record in a SQL Server table with (obviously) different unique IDs.
CustomerId FirstName LastName|
1 John Doe |
2 John Doe |
There are child items that are already in the database (let's say an orders table), some relate to one of the items and some relate to the other.
OrderId CustomerId DateEntered|
100 1 2018/11/01 |
101 2 2018/11/09 |
They are both referring to the same customer.
I would like to delete the duplicate record. Is there a way to automatically update the CustomerIds in the Orders table that has a value of 2 to have a value of 1?
sql-server entity-framework asked Nov 18 '18 at 19:51
IzzyIzzy
464
add a comment |
I have a duplicate record in a SQL Server table with (obviously) different unique IDs.
CustomerId FirstName LastName|
1 John Doe |
2 John Doe |
There are child items that are already in the database (let's say an orders table), some relate to one of the items and some relate to the other.
OrderId CustomerId DateEntered|
100 1 2018/11/01 |
101 2 2018/11/09 |
They are both referring to the same customer.
I would like to delete the duplicate record. Is there a way to automatically update the CustomerIds in the Orders table that has a value of 2 to have a value of 1?
sql-server entity-framework asked Nov 18 '18 at 19:51
IzzyIzzy
464
Sample data and expected results as formatted text please not images.
– Sami
Nov 18 '18 at 20:02
1
The short answer is NO... Nothing that would work automatically. You'd have to find all FK references to "CustomerID" (hopefully the database in question actually has good DRI) and generate commands to update their values.
– Jason A. Long
Nov 18 '18 at 21:13
add a comment |
I have a duplicate record in a SQL Server table with (obviously) different unique IDs.
CustomerId FirstName LastName|
1 John Doe |
2 John Doe |
There are child items that are already in the database (let's say an orders table), some relate to one of the items and some relate to the other.
OrderId CustomerId DateEntered|
100 1 2018/11/01 |
101 2 2018/11/09 |
They are both referring to the same customer.
I would like to delete the duplicate record. Is there a way to automatically update the CustomerIds in the Orders table that has a value of 2 to have a value of 1?
sql-server entity-framework asked Nov 18 '18 at 19:51
IzzyIzzy
464
I have a duplicate record in a SQL Server table with (obviously) different unique IDs.
CustomerId FirstName LastName|
1 John Doe |
2 John Doe |
There are child items that are already in the database (let's say an orders table), some relate to one of the items and some relate to the other.
OrderId CustomerId DateEntered|
100 1 2018/11/01 |
101 2 2018/11/09 |
They are both referring to the same customer.
I would like to delete the duplicate record. Is there a way to automatically update the CustomerIds in the Orders table that has a value of 2 to have a value of 1?
sql-server entity-framework sql-server entity-framework asked Nov 18 '18 at 19:51
IzzyIzzy
464
asked Nov 18 '18 at 19:51
IzzyIzzy
464
edited Nov 18 '18 at 20:25
Izzy
asked Nov 18 '18 at 19:51
IzzyIzzy
464
asked Nov 18 '18 at 19:51
IzzyIzzy
464
asked Nov 18 '18 at 19:51
IzzyIzzy
464
464
Sample data and expected results as formatted text please not images.
– Sami
Nov 18 '18 at 20:02
1
The short answer is NO... Nothing that would work automatically. You'd have to find all FK references to "CustomerID" (hopefully the database in question actually has good DRI) and generate commands to update their values.
– Jason A. Long
Nov 18 '18 at 21:13
add a comment |
Sample data and expected results as formatted text please not images.
– Sami
Nov 18 '18 at 20:02
1
The short answer is NO... Nothing that would work automatically. You'd have to find all FK references to "CustomerID" (hopefully the database in question actually has good DRI) and generate commands to update their values.
– Jason A. Long
Nov 18 '18 at 21:13
Sample data and expected results as formatted text please not images.
– Sami
Nov 18 '18 at 20:02
Sample data and expected results as formatted text please not images.
– Sami
Nov 18 '18 at 20:02
1
1
The short answer is NO... Nothing that would work automatically. You'd have to find all FK references to "CustomerID" (hopefully the database in question actually has good DRI) and generate commands to update their values.
– Jason A. Long
Nov 18 '18 at 21:13
The short answer is NO... Nothing that would work automatically. You'd have to find all FK references to "CustomerID" (hopefully the database in question actually has good DRI) and generate commands to update their values.
– Jason A. Long
Nov 18 '18 at 21:13
add a comment |
1 Answer
1
active
oldest
votes
You can use a window function to solve this
WITH CTE AS
(
SELECT T1.*,
MIN(T1.CustomerId) OVER(PARTITION BY T1.FirstName, T1.LastName ORDER BY T1.CustomerId) RN
FROM T1
)
UPDATE T2
SET T2.CustomerId = CTE.RN
FROM T2 INNER JOIN CTE ON T2.CustomerId = CTE.CustomerId;
Demo
But in the first place you need to fix this, the customer should have one(1) Unique id, not multiple IDs.
answered Nov 18 '18 at 21:12
SamiSami
8,89831241
Thank you. What I wanted to know was if SQL Server has built in that the records in the other tables that relate to this record can automatically be updated to the record it was merged into without specifically updating the CustomerId in the record in T2.
– Izzy
Nov 19 '18 at 22:07
It also does happen as sometimes someone adds a customer because he spelled it differently than the one in the database and thinks that it does not exist yet.
– Izzy
Nov 19 '18 at 22:09
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
You can use a window function to solve this
WITH CTE AS
(
SELECT T1.*,
MIN(T1.CustomerId) OVER(PARTITION BY T1.FirstName, T1.LastName ORDER BY T1.CustomerId) RN
FROM T1
)
UPDATE T2
SET T2.CustomerId = CTE.RN
FROM T2 INNER JOIN CTE ON T2.CustomerId = CTE.CustomerId;
Demo
But in the first place you need to fix this, the customer should have one(1) Unique id, not multiple IDs.
answered Nov 18 '18 at 21:12
SamiSami
8,89831241
Thank you. What I wanted to know was if SQL Server has built in that the records in the other tables that relate to this record can automatically be updated to the record it was merged into without specifically updating the CustomerId in the record in T2.
– Izzy
Nov 19 '18 at 22:07
It also does happen as sometimes someone adds a customer because he spelled it differently than the one in the database and thinks that it does not exist yet.
– Izzy
Nov 19 '18 at 22:09
add a comment |
You can use a window function to solve this
WITH CTE AS
(
SELECT T1.*,
MIN(T1.CustomerId) OVER(PARTITION BY T1.FirstName, T1.LastName ORDER BY T1.CustomerId) RN
FROM T1
)
UPDATE T2
SET T2.CustomerId = CTE.RN
FROM T2 INNER JOIN CTE ON T2.CustomerId = CTE.CustomerId;
Demo
But in the first place you need to fix this, the customer should have one(1) Unique id, not multiple IDs.
answered Nov 18 '18 at 21:12
SamiSami
8,89831241
Thank you. What I wanted to know was if SQL Server has built in that the records in the other tables that relate to this record can automatically be updated to the record it was merged into without specifically updating the CustomerId in the record in T2.
– Izzy
Nov 19 '18 at 22:07
It also does happen as sometimes someone adds a customer because he spelled it differently than the one in the database and thinks that it does not exist yet.
– Izzy
Nov 19 '18 at 22:09
add a comment |
You can use a window function to solve this
WITH CTE AS
(
SELECT T1.*,
MIN(T1.CustomerId) OVER(PARTITION BY T1.FirstName, T1.LastName ORDER BY T1.CustomerId) RN
FROM T1
)
UPDATE T2
SET T2.CustomerId = CTE.RN
FROM T2 INNER JOIN CTE ON T2.CustomerId = CTE.CustomerId;
Demo
But in the first place you need to fix this, the customer should have one(1) Unique id, not multiple IDs.
answered Nov 18 '18 at 21:12
SamiSami
8,89831241
You can use a window function to solve this
WITH CTE AS
(
SELECT T1.*,
MIN(T1.CustomerId) OVER(PARTITION BY T1.FirstName, T1.LastName ORDER BY T1.CustomerId) RN
FROM T1
)
UPDATE T2
SET T2.CustomerId = CTE.RN
FROM T2 INNER JOIN CTE ON T2.CustomerId = CTE.CustomerId;
Demo
But in the first place you need to fix this, the customer should have one(1) Unique id, not multiple IDs.
answered Nov 18 '18 at 21:12
SamiSami
8,89831241
edited Nov 18 '18 at 21:17
answered Nov 18 '18 at 21:12
SamiSami
8,89831241
answered Nov 18 '18 at 21:12
SamiSami
8,89831241
answered Nov 18 '18 at 21:12
SamiSami
8,89831241
8,89831241
Thank you. What I wanted to know was if SQL Server has built in that the records in the other tables that relate to this record can automatically be updated to the record it was merged into without specifically updating the CustomerId in the record in T2.
– Izzy
Nov 19 '18 at 22:07
It also does happen as sometimes someone adds a customer because he spelled it differently than the one in the database and thinks that it does not exist yet.
– Izzy
Nov 19 '18 at 22:09
add a comment |
Thank you. What I wanted to know was if SQL Server has built in that the records in the other tables that relate to this record can automatically be updated to the record it was merged into without specifically updating the CustomerId in the record in T2.
– Izzy
Nov 19 '18 at 22:07
It also does happen as sometimes someone adds a customer because he spelled it differently than the one in the database and thinks that it does not exist yet.
– Izzy
Nov 19 '18 at 22:09
Thank you. What I wanted to know was if SQL Server has built in that the records in the other tables that relate to this record can automatically be updated to the record it was merged into without specifically updating the CustomerId in the record in T2.
– Izzy
Nov 19 '18 at 22:07
Thank you. What I wanted to know was if SQL Server has built in that the records in the other tables that relate to this record can automatically be updated to the record it was merged into without specifically updating the CustomerId in the record in T2.
– Izzy
Nov 19 '18 at 22:07
It also does happen as sometimes someone adds a customer because he spelled it differently than the one in the database and thinks that it does not exist yet.
– Izzy
Nov 19 '18 at 22:09
It also does happen as sometimes someone adds a customer because he spelled it differently than the one in the database and thinks that it does not exist yet.
– Izzy
Nov 19 '18 at 22:09
add a comment |
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Sample data and expected results as formatted text please not images.
– Sami
Nov 18 '18 at 20:02
1
The short answer is NO... Nothing that would work automatically. You'd have to find all FK references to "CustomerID" (hopefully the database in question actually has good DRI) and generate commands to update their values.
– Jason A. Long
Nov 18 '18 at 21:13