SELECT查询的时候，结果显示不全，比如说sessionid中有十个人的数据，查询结果只能显示一部分人的，
请问这种情况是怎么发生的呢，有怎么样的解决方案？
SELECT DISTINCT
TO_CHAR(VA.COMPANYHIREDTM,'YYYY/MM/DD') AS 进入集团日期,
VA.PERSONNUM AS 工号,
VA.PERSONFULLNAME AS 姓名,
VA.HOMELABORLEVELDSC3 AS 人员类别,
VA.HOMELABORLEVELDSC1 AS 事业本部,
VA.HOMELABORLEVELDSC2 AS 部门,
P2.PERSONCSTMDATATXT AS 职务,
P3.PERSONCSTMDATATXT AS 职级,
P1.PERSONCSTMDATATXT AS 工序,
TO_CHAR(APPLYDATE,'YYYY/MM/DD') AS 日期,
OFILM_FN_COMENTDSC(VT.PERSONNUM,VT.APPLYDATE) AS 班别,
TO_CHAR((OFILM_FN_INPUNCH1(VT.PERSONNUM,VT.APPLYDATE)), 'HH24:MI') AS 上班时间1,
'' AS 下班时间1,
'' AS 上班时间2,
TO_CHAR((OFILM_FN_OUTPUNCH2(VT.PERSONNUM,VT.APPLYDATE)),'HH24:MI' ) AS 下班时间2,
TO_CHAR((OFILM_FN_SHIFTENDTIME(VT.PERSONNUM,VT.APPLYDATE)),'HH24:MI' ) AS 标准下班时间,
OFILM_FN_STATUS(VT.PERSONNUM,VT.APPLYDATE) AS 出勤状态,
OFILM_FN_OVERTIME(VT.PERSONNUM,VT.APPLYDATE) AS 加班时间
FROM VP_TOTALS VT
LEFT JOIN VP_ALLPERSONV42 VA ON VT.PERSONNUM=VA.PERSONNUM
LEFT JOIN mywtkemployee MWE on VT.employeeid=MWE.employeeid
JOIN PERSONCSTMDATA P1 ON VT.PERSONID=P1.PERSONID
JOIN PERSONCSTMDATA P2 ON VT.PERSONID=P2.PERSONID
JOIN PERSONCSTMDATA P3 ON VT.PERSONID=P3.PERSONID
WHERE P1.CUSTOMDATADEFID = 1
AND P2.CUSTOMDATADEFID = 6
AND P3.CUSTOMDATADEFID = 7
AND MWE.SESSIONID=:wtksessionid
AND APPLYDATE BETWEEN :From_timeframe AND :To_timeframe
ORDER BY VA.PERSONNUM,APPLYDATE
------解决思路----------------------
P1.CUSTOMDATADEFID = 1
AND P2.CUSTOMDATADEFID = 6
AND P3.CUSTOMDATADEFID = 7
AND APPLYDATE BETWEEN :From_timeframe AND :To_timeframe
把这几个条件调整到on后面的连接条件中，把后面的join改为left join
这个条件应该是筛选掉一部分数据