mysql update case 更新字段值不固定的操作

UPDATE tablename 
set a1= CASE userid 
 WHEN 1 THEN a1+5 
 WHEN 2 THEN a1+2 
 END,
a2= CASE userid 
 WHEN 1 THEN a2-5 
 WHEN 2 THEN a2-2
END
where userid in (1,2)

UPDATE t_report SET room = CONCAT_WS( '-', SUBSTRING_INDEX(room, '-', 1) ,
 CASE SUBSTRING_INDEX(room, '-', -1) 
 WHEN 'N01' THEN 'N02' 
 WHEN 'N02' THEN 'N01'
 WHEN 'N03' THEN 'N11'
 WHEN 'N04' THEN 'N10'
 WHEN 'N05' THEN 'N09'
 WHEN 'N06' THEN 'N08'
 WHEN 'N07' THEN 'N07'
 WHEN 'N08' THEN 'N06'
 WHEN 'N09' THEN 'N05'
 WHEN 'N10' THEN 'N03'
 END )
WHERE rid IN ( 
 SELECT rid FROM t_report WHERE rdate = '190306' AND ordinal BETWEEN '23' AND '32'
)