Mysql查询最近的条目

Question

如何执行Mysql查询来获取每种类型的最新条目。然后对它们进行计数，并根据名称显示。谢谢

MYsql数据库

Id | Date      | Type | Name  | Time  
1    11/8/2010 | 12312| Bill  | 7:30 AM  
2    11/8/2010 | 12311| Bill  | 7:45 PM  
3    11/8/2010 | 12312| Bill  | 8:30 AM  
4    11/8/2010 | 12310| Bill  | 9:40 AM  
5    11/8/2010 | 12312| Rich  | 7:30 AM  
6    11/8/2010 | 12312| Rich  | 7:45 PM  
7    11/8/2010 | 12312| Jim  | 8:30 AM  
8    11/8/2010 | 12310| Jim  | 9:40 AM  
9    11/8/2010 | 12312| Jim  | 7:30 AM  
10   11/8/2010 | 12310| Jim  | 7:45 AM  

mysql查询/php输出

Bill = 3    
2    11/8/2010 | 12311| Bill  | 7:45 PM  
3    11/8/2010 | 12312| Bill  | 8:30 AM  
4    11/8/2010 | 12310| Bill  | 9:40 AM  
Rich = 1  
6    11/8/2010 | 12312| Rich  | 7:45 PM  
Jim = 2  
7    11/8/2010 | 12312| Jim  | 8:30 AM  
8    11/8/2010 | 12310| Jim  | 9:40 AM  

Answer 1

SELECT  m.*
FROM    (
        SELECT  DISTINCT name, type
        FROM    mytable
        ) md
JOIN    mytable m
ON      m.id =
        (
        SELECT  id
        FROM    mytable mi
        WHERE   mi.name = md.name
                AND mi.type = md.type
        ORDER BY
                mi.name DESC, mi.type DESC, mi.date DESC, mi.id DESC
        LIMIT 1
        )

在mytable (name, type, date, id)上创建索引，以便快速执行此操作。