Posted By: Anonymous
UPDATE dbo.TestStudents SET LASTNAME = ( CASE WHEN (LASTNAME = 'AAA') THEN 'BBB' WHEN (LASTNAME = 'CCC') THEN 'DDD' WHEN (LASTNAME = 'EEE') THEN 'FFF' ELSE (LASTNAME) END )
The statement work for the purpose but the else condition scan through every record in the table. Is there any way I can leave the unaffected rows as they are?
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')