Mysql语句的批量操作[修改]

UPDATE `cla_info` SET 

`comment` =  CASE 
WHEN (`score` >= 95) THEN 'A' 
WHEN (`score` < 95 AND `score` >= 80) THEN 'B' 
WHEN (`score` < 80 AND `score` >= 60) THEN 'C' 
WHEN (`score` < 60) THEN 'D' 
END, 

`collect` = CASE 
WHEN (`score` >= 95) THEN 'X' 
WHEN (`score` < 95 AND `score` >= 60) THEN 'Y'
WHEN (`score` < 60) THEN 'Z' 
END 

WHERE `id` > 2