Question

我想知道是否有可能获得行值之和，其中某些行是不同的名称。我知道我需要使用一个总和，但不确定如何仅在行名匹配的地方进行总和。

这是我当前正在使用的查询

SELECT b.visits, b.country FROM urls_analytics AS a 
JOIN analytics AS b ON a.urls_slug = b.slug 
WHERE creator_user_id='some user id'
AND a.urls_slug='some slug' 
AND b.continent="NA"
AND b.visit_date >= (DATE(NOW()) - INTERVAL 7 DAY)

这是我现在查询的输出。

visits country
5      Canada
10      Canada
15      Canada
5      Canada
5      United States
10      United States
5      Austraillia

这就是我希望查询返回结果的方式

visits country
35     Canada
15      United States
5      Austraillia

Answer 1

仅group by个国家/地区名称

SELECT sum(b.visits) sum_visits, b.country FROM urls_analytics AS a 
JOIN analytics AS b ON a.urls_slug = b.slug 
WHERE creator_user_id='some user id'
AND a.urls_slug='some slug' 
AND b.continent="NA"
AND b.visit_date >= (DATE(NOW()) - INTERVAL 7 DAY)
group by b.country;

Answer 2

您可以使用GROUP BY子句对country字段进行汇总，并使用SUM函数对值求和：

SELECT SUM(b.visits) AS visits, b.country FROM urls_analytics AS a 
JOIN analytics AS b ON a.urls_slug = b.slug 
WHERE creator_user_id='some user id'
AND a.urls_slug='some slug' 
AND b.continent="NA"
AND b.visit_date >= (CURDATE() - INTERVAL 7 DAY)
GROUP BY b.country

请注意，您可以将CURDATE()用作DATE(NOW())的简写

Answer 3

您需要使用“ group by”。

SELECT 
    SUM(b.visits),
    b.country
FROM 
    urls_analytics AS a JOIN analytics AS b ON a.urls_slug = b.slug 
WHERE 
    creator_user_id='some user id' AND 
    a.urls_slug='some slug' AND
    b.continent="NA" AND 
    b.visit_date >= (DATE(NOW()) - INTERVAL 7 DAY) 
GROUP BY b.country

MySQL列总和值

3 个答案: