Swap values for two rows in the same table in SQL Server

Question

I want to swap the values from two rows in a table. I have the rows IDs of the two rows. Is there any query to do that? Here is an example. Before the query I have this:

Answer 1

UPDATE t1
SET
t1.col1 = t2.col1
,t1.col2 = t2.col2
,t1.col3 = t2.col3
,t1.col4 = t2.col4
--and so forth...
FROM YourTable AS t1
INNER JOIN YourTable AS t2
    ON      (t1.ID = '1'
            AND t2.ID = '2')
        OR
            (t1.ID = '2'
            AND t2.ID = '1')

You don't necessarily need to use the ID column of your table, I believe you could search by any column, with the proper joining logic. Joining the table to itself is the trick.

Answer 2

You need to select all records by "WHERE" condition, Then "SET" update by "CASE" condition.

UPDATE tbl_Temp SET 
fk_userType = CASE fk_userType WHEN 1 THEN 2 WHEN 2 THEN 1 END,
fk_userRole = CASE fk_userRole WHEN 1 THEN 2 WHEN 2 THEN 1 END
WHERE (fk_userType = 1 AND fk_userRole = 1) OR (fk_userType = 2 AND fk_userRole = 2);