zoukankan      html  css  js  c++  java
  • SQL 查询语句(备份)

    分组查询

    1、分组查询后获取分组后的前5条数据

    1 SELECT * FROM (SELECT rid = ROW_NUMBER() OVER (PARTITION BY FoodParentID ORDER BY FoodParentID DESC), * FROM FoodLibInfo) AS T WHERE rid <= 5 
    View Code

    2、分组查询后随机获取每一组的5条数据

    1 SELECT * FROM (SELECT rid = ROW_NUMBER() OVER (PARTITION BY FoodParentID ORDER BY newid()), * FROM FoodLibInfo) AS T WHERE rid <= 5 
    View Code

     排名查询:

    1、使用ROW_NUMBER()函数,分数相同按照Id升序排名

    1 SELECT ID,result,ROW_NUMBER() over (order by result desc,ID Asc) as RowId FROM answer group by Q_user_ID,Q_result
    View Code

    2、分数相同的排名相同

    SELECT a.ID,a.result,
    Place=(SELECT COUNT(result) FROM answer WHERE result>a.result )+1
    FROM answer a where ORDER BY Place 
    View Code
    可能有用的:http://www.cnblogs.com/zengxiangzhan/archive/2009/09/23/1572276.html
  • 相关阅读:
    nth-of-type()的用法
    H5禁止底部横向滚动条,使一个元素居中
    CRM项目-1模型与站点管理
    django-debug-toolbar
    python发送邮件
    os 模块
    Django(三) ORM操作
    Django框架初识
    JS 正则表达式
    前端-高潮 jQuery
  • 原文地址:https://www.cnblogs.com/xiezhi-sanlang/p/3156830.html
Copyright © 2011-2022 走看看