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 (50,207,232,238,237,236,235,231,234,233,206,228,230,229,227,226,205,209,211,208,210) order by xl = 'desc'