mysql获取最后3行并比较记录

Question

我有一张表如何才能获得最后3行进行比较并得到计数？

示例：表

id| name
=========
1 | Apple
2 | Orange
3 | Kiwi
4 | Banana
5 | Apple
6 | Banana
7 | Apple

如何获得最后3行的Apple计数？

非常感谢

Answer 1

你的问题不明确，但如果我理解正确的话; 检查查询和结果：

查询 - 1：

SELECT 
    id, name, COUNT(*) AS total_row
FROM
   furits
GROUP BY NAME ORDER BY id DESC LIMIT 0,3;

结果 - 1：

id| name   | total_row  
======================
4 | Banana | 2
3 | Kiwi   | 1
2 | Orange | 1

查询 - 2：

SELECT 
    id, name, COUNT(*) AS total
FROM
   furits
GROUP BY NAME ORDER BY id DESC;

结果 - 2：

id| name   | total_row  
======================
4 | Banana | 2
3 | Kiwi   | 1
2 | Orange | 1
1 | Apple  | 3

查询 - 3：

SELECT 
    id, name, COUNT(*) AS total_row
FROM
   furits 
WHERE 
    name = 'Apple'
GROUP BY NAME LIMIT 0,1;

结果 - 3：

id| name   | total_row  
======================
1 | Apple  | 3

我希望这有帮助。

Answer 2

您可以使用临时表来选择最后3行，使用结果行

 select name, count(*) from 
    (select name,id 
     from my_table 
     order by id desc limit 3)  t
group by name