Question

我存储命中。我的表看起来像这样：

    ID |   time   |   Country   
--------------------------------
    1  | 01:00:00 |    France
    2  | 01:00:00 |    Brazil
    3  | 01:00:00 |    USA
    4  | 02:00:00 |    USA

这是我的疑问：

SELECT COUNT(*) as total_hits, HOUR(time) as hour, Country
FROM hits 
WHERE time >= CURDATE() 
GROUP BY HOUR(time)

它确实计算了我得到的点击次数并按小时分组：

01:00:00
Total hits: 3

02:00:00
Total hits: 1

但这就是我的需要：

01:00:00
Total hits: 3

02:00:00
Total hits: 1
-----------

France: 1
USA: 2
Brazil: 1

我知道我能做到：

SELECT
       COUNT(*)
     , HOUR(time)
     , COUNT(IF( Country = 'France', Country, null)) AS France
     , COUNT(IF( Country = 'USA', Country, null)) AS USA
     , COUNT(IF( Country = 'Brazil', Country, null)) AS Brazil
FROM hits
WHERE time >= CURDATE()
GROUP BY HOUR(time)

或者使用CASE或SUM(Country = 'France') AS France。

但在国家专栏中，不仅仅有3个国家。如果我对每个国家都这样做，我的查询会很长。

修改

我可以像Alex Monthy一样回答：

SELECT COUNT(*), Country, HOUR(time)
FROM hits 
WHERE time >= CURDATE() 
GROUP BY Country, HOUR(time)

但是输出将是这样的：

01:00:00
Total hits: 1
Country: France

01:00:00
Total hits: 1
Country: Brazil

01:00:00
Total hits: 1
Country: USA

02:00:00
Total hits: 1
Country: USA

但是我需要一个如上所述的输出。

TL; DR ：我想要一个按时间分组的结果，另一个按国家分组。

Answer 1

正如你自己说的那样：

我需要按时间（小时）和国家/地区分组

就这样做：

SELECT COUNT(*), Country, HOUR(time)
FROM hits 
WHERE time >= CURDATE() 
GROUP BY Country, HOUR(time)

Answer 2

可能需要使用交叉连接来获取每个国家/小时的计数的子查询，然后将其连接到点击以获得总计数，使用GROUP_CONCAT来提供该小时的国家/地区计数

这样的事情： -

SELECT hour(hits.time), COUNT(DISTINCT hits.id), GROUP_CONCAT(DISTINCT CONCAT_WS(' - ', sub0.Country, sub0.country_count))
FROM hits
INNER JOIN
(
    SELECT hour(hits.time) as the_hour, Country, COUNT(*) AS country_count
    FROM hits
    GROUP BY the_hour, Country
) sub0
ON hour(hits.time) = sub0.the_hour
GROUP BY the_hour

Answer 3

真的不确定，但你试过吗

SELECT COUNT(*), HOUR(time)
FROM hits 
WHERE time >= CURDATE() 
GROUP BY Country

Answer 4

SELECT COUNT(*) AS `totals`, country, HOUR(time) AS `hour`
FROM hits 
WHERE time >= CURDATE() 
GROUP BY country, HOUR(time) WITH ROLLUP;

这不仅可以按国家/地区和小时为您提供分组，还可以为具有总计的国家/地区提供小计。

http://dev.mysql.com/doc/refman/5.7/en/group-by-modifiers.html

Answer 5

试试这个

SELECT
DISTINCT Country,
COUNT(HOUR (time))
FROM
hits
WHERE
time >= CURDATE() 
GROUP BY country

MySQL（PHP）：COUNT个国家和GROUP BY时间

5 个答案: