我有以下关于tf/idf测量的问题。我的目标是为每个日期获得前10名，如前10名20160401，前10名20160402等，但根据我的查询，我有超过10为每个日期。因为它可以看到我不能得到订单，应该只有一个1，一个2一3，我的意思是每个日期最多10。

date     word rowNumber
20160401 word     1
20160401 word     2 
..
20160401 word     10 
-------------------
20160402 word     1
20160402 word     2 
..
20160402 word     10

以下是我对tf-idf测量的查询。在newsdetails表中，我有如下列和值

date        word     wordCount
 20160401    yürürlük      1
 20160401    mülteci       1
 20160401    anlaşma       2
 20160401    pazartesi     1
 20160401    itibaren      1
 20160401    uygula        2
-------------------
      SELECT t.newsCreatedTime,t.word,t.tf_idf as tweetRatio ,rn
       FROM (
       select w.newsCreatedTime,w.word,w.wordCount,t1.topic_sum,w.wordCount/t1.topic_sum as tf, 
             t2.idf,(w.wordCount/t1.topic_sum)*(t2.idf) as tf_idf,
          (@rn := if(@t = w.newsCreatedTime, @rn + 1,
                     if(@t := w.newsCreatedTime, 1, 1)
                    )
          ) as rn
       FROM newsdetails  w JOIN
       ( select newsCreatedTime, sum(wordCount) as topic_sum 
        from newsdetails where trim(word)<>'limit' and length(trim(word))>3 and  newsCreatedTime>=20160401
        group by newsCreatedTime 
       ) t1
        on w.newsCreatedTime=t1.newsCreatedTime  and trim(w.word)<>'limit' and length(trim(w.word))>3 and  w.newsCreatedTime>=20160401
        join (
          select w.word, log10(t_cnts.cnts/count(*)) as idf 
          from newsdetails w,
          (select count(distinct newsCreatedTime) as cnts from newsdetails where trim(word)<>'limit' and length(trim(word))>3 and  newsCreatedTime>=20160401) t_cnts
          group by w.word 
          ) t2 
         on w.word=t2.word CROSS JOIN
        (SELECT @t := '', @rn := 0) params 
        ORDER BY tf_idf desc 
       ) t
       WHERE rn <=10

输出为：

Date        word            ratio           rowNumber
20160401    kadın        -0.0005375613007471833      1
20160401    beyaz        -0.00006167450024777626     1
20160401    alışveriş    -0.000015563777946653284    1
20160401    ösym          0                          1
20160401    yürürlük      0.00004586823255826781     1
20160401    haber        -0.0003304889014365445      2
20160401    taraf        -0.00019041987363584725     2
20160401    merkezi      -0.00013800691483414033     2
20160401    mülteci      -0.000056636107108483694    2
20160401    perde         0.00004941253963307586     2
20160401    sınav        -0.00017806007150496475     3

但我只想得到每个日期的前10个单词和它们的比例。