union的使用

需求：把员工全部显示在积分排名里面；select     m.id, m.empId, m.orgId, m.eveName, m.czSocre, m.czType, m.optDate, m.optType, m.operPerson,     m.checkPerson, m.jktypeid, m.jktypename, m.isprint, m.creatTime,m.remark,m.tatalA,    (select employeeName from QY_EMPLOYEE where employeeId = m.empId) employeename,    (select jobNumber from QY_EMPLOYEE where employeeId = m.empId) jobnumber,    (select departmentName from QY_ORGANIZATION where ID = (select department from QY_EMPLOYEE where employeeId = m.empId)) departmentname,    (select sum(czSocre)czjf from CZ_QUERY_RANK where orgId = 'E000102' AND isprint='1' and empId = m.empId) czSocrejf,     (select sum(czSocre)czkf from CZ_QUERY_RANK where orgId = 'E000102' AND isprint='2' and empId = m.empId) czSocrekf    from     (        select g.*,tt.tatalA from CZ_QUERY_RANK g inner join         (        SELECT x.empId,x.orgId,(x.jfa-IFNULL(b.kfa,0)) tatalA         FROM         (SELECT empId,orgId,SUM(optA) jfa FROM JF_QUERY_RANK WHERE orgId='E000102' AND scoType='1'        GROUP BY empId ) x LEFT JOIN(        SELECT empId,orgId,SUM(optA) kfa FROM JF_QUERY_RANK WHERE orgId='E000102' AND scoType='2' GROUP BY empId         ) b ON x.empId=b.empId        )tt on g.empId = tt.empId group by empId    ) m     where m.orgId = 'E000102'unionselect NULL AS id, employeeId as empId,enterpriseId as orgId,null AS eveName,0 AS czSocre,null AS czType,null AS optDate, null AS optType,null AS operPerson,null AS checkPerson,null AS jktypeid,null AS jktypename,null AS isprint,null AS creatTime,null AS remark,0 AS tatalA,employeeName as employeename,jobNumber as jobnumber,(select departmentName from QY_ORGANIZATION where ID = department) departmentname,0 AS czSocrejf,0 AS czSocrekf from QY_EMPLOYEE where enterpriseId='E000102'