Add a WHERE
clause
UPDATE dbo.TestStudents SET LASTNAME = CASE WHEN LASTNAME = 'AAA' THEN 'BBB' WHEN LASTNAME = 'CCC' THEN 'DDD' WHEN LASTNAME = 'EEE' THEN 'FFF' ELSE LASTNAME END WHERE LASTNAME IN ('AAA', 'CCC', 'EEE')
Add a WHERE
clause
UPDATE dbo.TestStudents SET LASTNAME = CASE WHEN LASTNAME = 'AAA' THEN 'BBB' WHEN LASTNAME = 'CCC' THEN 'DDD' WHEN LASTNAME = 'EEE' THEN 'FFF' ELSE LASTNAME END WHERE LASTNAME IN ('AAA', 'CCC', 'EEE')