DECLARE @t TABLE(city VARCHAR(1))
INSERT INTO @t(city)
VALUES ('A'),( 'B'),( 'C'),( 'A'),( 'B'),( 'C'),( 'A');
-- do a select and not the results for comparison purposes
SELECT city FROM @t
SET city = CASE city
WHEN 'A' THEN 'B'
WHEN 'B' THEN 'A'
-- select after update to compare with initial select
select * from @t
SQL 2000/2005/2008/2012 DBA - MCTS/MCITP