如何在sql查询中使用group by

Question

我想在sql查询中获得164条记录，但我获得了90,000条记录

我的MySql查询提供正确的输出

SELECT distinct(sourceadd), 
       starttime,
       destadd,
       calltype,
       bw,
       adjustdur 
FROM cma 
where starttime between '2011/07/01' and  '2014/07/02'   
and calltype = 'ad hoc'  
group by sourceadd 
order by sourceadd asc;

我的M $ Sql查询提供了更多错误的记录

Select * from 
  (SELECT distinct(sourceadd), 
          starttime,
          destadd,
          calltype,
          bw,
          adjustdur,
          ROW_NUMBER()over(order by sourceadd) as row 
   FROM cma 
   WHERE starttime between '2011/07/01' and  '2014/07/02' 
   and calltype= 'ad hoc') cma 
where cma.row > 0 
and cma.row <= 100000