django 查询数据库,获得某一个用户的 “排名”, 除了整个数据库排序,找出 下标, 有更好的方法的吗?? - V2EX
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1989922yan

django 查询数据库,获得某一个用户的 “排名”, 除了整个数据库排序,找出 下标, 有更好的方法的吗??

  •  
  •   1989922yan Jul 16, 2014 5656 views
    This topic created in 4306 days ago, the information mentioned may be changed or developed.
    6 replies    2014-07-17 01:34:43 +08:00
    zoowii
        1
    zoowii  
       Jul 16, 2014   1
    以前看到过的方法, 按区间划分,更新用户的分数(或者其他什么的)时候,用户所在的排名区间可以算出来,每个区间有多少人也可以知道.然后只要求出用户在那个小区间是多少名就好了
    yueyoum
        2
    yueyoum  
       Jul 16, 2014   1
    排名应用 用 redis zset, 生活从此变得美好
    vicalloy
        3
    vicalloy  
       Jul 16, 2014   1
    这样?
    select count(*) from xxx where yy>'zz'
    1989922yan
        4
    1989922yan  
    OP
       Jul 16, 2014
    @yueyoum
    哈哈哈,赞一个,好的
    Zuckonit
        5
    Zuckonit  
       Jul 16, 2014
    @yueyoum +1, 典型的redis应用场景
    20150517
        6
    20150517  
       Jul 17, 2014 via Android
    为什么要整个数据重新排序?你数据应该原来就是按用户排名,你得到用户新排名只要一个b树查找就知道了,怎么可能full scan
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