出错啦！
错误信息：Unknown column 'xl' in 'order clause'
错误编号：1054
SQL语句：select count(*) from pro_co where pass='yes' and lm in (48,166,186,459,460,457,196,185,193,192,191,190,184,189,188,187,167,197,200,456,199,198) order by xl = 'desc'