select (select COUNT(*) from Base_WLMXDY where wlmxdy_ztid='704')-(select COUNT(*) from Base_WLMXDY where wlmxdy_ztid='717')
select (select COUNT(*) from Base_WLMXDY where wlmxdy_ztid='804')-(select COUNT(*) from Base_WLMXDY where wlmxdy_ztid='817')