最大计数（*）

Question

我的表结构是

| Field      | Type      | Null | Key | Default           | Extra |
| uid        | char(255) | NO   |     |                   |       |
| lid        | char(255) | NO   | MUL |                   |       |
| ip_address | char(15)  | NO   |     |                   |       |
| user_agent | char(255) | YES  |     | NULL              |       |
| open_date  | timestamp | NO   | MUL | CURRENT_TIMESTAMP |       |
| referrer   | char(255) | YES  |     | NULL              |       |
| environ    | text      | YES  |     | NULL              |       |
| country    | char(255) | NO   | MUL |                   |       |

我想查询一个月中特定日期的最高点击次数

查询

select count(open_date) as c,day(open_date) as d
from link_click 
where month(open_date)="01" and year(open_date)="2011" 
group by d
having c =MAX(c);

但结果是空集。

PLS。建议。

Answer 1

这就是你想要的吗？

select count(open_date) as c,day(open_date) as d
from link_click 
where month(open_date)="01" and year(open_date)="2011" 
group by d
order by c desc
limit 1;

Answer 2

这可能有效：

select * from (
  select count(open_date) as c,day(open_date) as d
  from link_click 
  where month(open_date)="01" and year(open_date)="2011" 
  group by d)
having c =MAX(c);