Mysql加入 - 结果重复如何修复它

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我对MySQL很新，也是我的第一个问题，如果有任何错误，请原谅我。Mysql加入 - 结果重复如何修复它

我6张桌子我想用这个6表采取报告。我的一个报告访问所有6个表并按照我们编写的查询打印数据。现在问题是我写了我的查询，但这会返回大量重复的数据。如何避免引导我请。

SELECT 
     @rownum := @rownum + 1 AS RowNumber, 
     a.vnumber,a.vname, 
     b.eid,b.name,b.mobile, 

     c.vid,c.emp_id,c.pick_place,c.start_time,c.drop_place,c.stop_time, 
     c.pickupkm,c.drops,c.type_of_trip,c.travelkm,c.tamt,c.dates, 
     d.vid,d.emp_id,d.expcal,d.exp1,d.exp2,d.exp3, 
     d.exp4,d.exp5,d.expamt,d.expdesc,d.dates, 
     e.emp_id,e.vid,e.opeing_km,e.opeing_cash,e.closing_km, 

     e.closing_cash,e.opeing_date,e.opeing_time,e.closing_date, 
     e.closing_time, f.vid,f.emp_id, 
     f.totkm,f.totamt,f.expenses,f.handover_amt, 
     f.balance_amt,f.handover_to,f.plstatus,f.entry_date 

    from 
     add_vehicle a 

     LEFT JOIN third_table c ON a.vnumber=c.vid 
     LEFT JOIN add_employees b ON b.eid=c.emp_id 
     LEFT JOIN fourth_table d ON a.vnumber=d.vid 
     LEFT JOIN shift e ON b.eid=e.emp_id 
     LEFT JOIN five_table f ON a.vnumber=f.vid, 

(SELECT @rownum := 0) r 
     WHERE 
       c.type_of_trip IS NOT NULL AND 
       c.dates BETWEEN '2017-04-01' AND '2017-04-19' AND 
       d.dates BETWEEN '2017-04-01' AND '2017-04-19' AND 
       f.entry_date BETWEEN '2017-04-01' AND '2017-04-19' AND 
       c.vid='STAT01' AND f.vid='STAT01' AND c.emp_id='1' AND 
       f.emp_id='1' AND e.emp_id='1' 

ORDER BY c.dates,f.entry_date DESC