mysql-case ... when...then...else...end处理判断赋值机制

select stockcode,stockname,(zxj-(case zrspj when 0 then jrkp else zrspj end ))/(case zrspj

when 0 then jrkp else zrspj end ) zdf

from hqxg

where stockcode like '_3%' and zxj-(case zrspj when 0 then jrkp else zrspj end )<0

order by zdf

LIMIT 0,3;