CODEWITHSUNDEEP
sqlsql-serverconstraintssql-update
Shiva
Shiva

Reputation: 1399

Swapping two rows in MS SQLServer retaining the original primary key and without manual update

I have the following problem : I have rows like 

ID   CODE     NAME            .........
1    h1100h1  Cool example1   .........
2    h654441  Another cool1   .........

I would like to swap them retaining all old primary keys and constraints. Of course, I can easily solve this manually by updating the rows. I am kind of wondering whether anybody has any excellent solution for this kind of problem instead of just executing update command manually. I really really appreciate any suggestions or recommendations.

Upvotes: 3

Views: 2611

Answers (2)

Tom H
Tom H

Reputation: 47464

I haven't tested this, but I think it will work. I'm assuming that id is a single-column Primary Key. If that's not the case then you will need to adjust this code slightly to handle the PK.

UPDATE
     T1
SET
     column_1 = T2.column_1,
     column_2 = T2.column_2,
     ...
FROM
     dbo.My_Table T1
INNER JOIN dbo.My_Table T2 ON
     T2.id =
          CASE
               WHEN T1.id = @id_1 THEN @id_2
               WHEN T1.id = @id_2 THEN @id_1
               ELSE NULL
          END
WHERE
     T1.id IN (@id_1, @id_2)

Upvotes: 6

SQLMenace
SQLMenace

Reputation: 135021

self join with an update is your only safe bet

Upvotes: -1

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