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今日真题题目介绍： 查询球队积分 team-scores-in-football-tournament

难度中等

SQL架构

Table:

代码语言：javascript复制Teams代码语言：javascript复制+---------------+----------+

| Column Name | Type |

+---------------+----------+

| team_id | int |

| team_name | varchar |

+---------------+----------+

此表的主键是 team_id，表中的每一行都代表一支独立足球队。Table:

代码语言：javascript复制Matches代码语言：javascript复制+---------------+---------+

| Column Name | Type |

+---------------+---------+

| match_id | int |

| host_team | int |

| guest_team | int |

| host_goals | int |

| guest_goals | int |

+---------------+---------+

此表的主键是 match_id，表中的每一行都代表一场已结束的比赛，比赛的主客队分别由它们自己的 id 表示，他们的进球由 host_goals 和 guest_goals 分别表示。积分规则如下：

赢一场得三分；平一场得一分；输一场不得分。写出一条SQL语句以查询每个队的 team_id，team_name 和 num_points。结果根据 num_points 降序排序，如果有两队积分相同，那么这两队按 team_id 升序排序。

查询结果格式如下：

``` Teams table: +-----------+--------------+ | team_id | team_name | +-----------+--------------+ | 10 | Leetcode FC | | 20 | NewYork FC | | 30 | Atlanta FC | | 40 | Chicago FC | | 50 | Toronto FC | +-----------+--------------+

Matches table: +------------+--------------+---------------+-------------+--------------+ | match_id | host_team | guest_team | host_goals | guest_goals | +------------+--------------+---------------+-------------+--------------+ | 1 | 10 | 20 | 3 | 0 | | 2 | 30 | 10 | 2 | 2 | | 3 | 10 | 50 | 5 | 1 | | 4 | 20 | 30 | 1 | 0 | | 5 | 50 | 30 | 1 | 0 | +------------+--------------+---------------+-------------+--------------+

Result table: +------------+--------------+---------------+ | team_id | team_name | num_points | +------------+--------------+---------------+ | 10 | Leetcode FC | 7 | | 20 | NewYork FC | 3 | | 50 | Toronto FC | 3 | | 30 | Atlanta FC | 1 | | 40 | Chicago FC | 0 | +------------+--------------+---------------+ ```

代码语言：javascript复制sql

select team_id , team_name ,sum(

if(team_id = host_team && host_goals>guest_goals ,3,0)+

if(team_id = host_team && host_goals=guest_goals,1,0)+

if(team_id = guest_team && host_goals=guest_goals,1,0)+

if(team_id = guest_team && host_goals

)num_points

from Teams t left join Matches m

on t.team_id =m.host_team or t.team_id =m.guest_team

group by team_id ,team_name

order by num_points desc,team_id已经有灵感了？在评论区写下你的思路吧！