服务器未知运行时异常: 
### Error querying database.  Cause: java.sql.SQLSyntaxErrorException: Unknown column 'su.id' in 'field list'
### The error may exist in file [D:\code\casic-metering-biz-xichang\casic-metering-dao\target\classes\mapper\system\DeptExtendMapper.xml]
### The error may involve defaultParameterMap
### The error occurred while setting parameters
### SQL: select                   sd.id AS "id", sd.id as "deptId", sd.num AS "num", sd.pid AS "pid", sd.pids AS "pids", sd.simple_name AS "simpleName",         sd.full_name AS "fullName", sd.tips AS "tips", sd.version AS "version", sd.dept_type as "deptType", sd.ip_segment as ipSegment,         su.id as directorId, su.name AS directorName               from sys_dept sd         left join             (SELECT su.id, su.NAME, su.DEPT_ID FROM sys_role sr             JOIN sys_ru_relation srr ON sr.ID = srr.ROLEID             JOIN sys_user su ON srr.USERID = su.ID WHERE sr.TIPS = "director") ss             on sd.ID = ss.DEPT_ID          WHERE  sd.del_flag = '0'          order by sd.num ASC LIMIT ?
### Cause: java.sql.SQLSyntaxErrorException: Unknown column 'su.id' in 'field list'
; bad SQL grammar []; nested exception is java.sql.SQLSyntaxErrorException: Unknown column 'su.id' in 'field list'