The following query returns me the total of 2 rows instead of 1 because it happens the video to have two categories associated.
SELECT COUNT(video.id) AS `total`
FROM `videos` AS `video`
INNER JOIN `videos_categories` AS `video_category` ON `video_category`.`video_id` = `video`.`id`
INNER JOIN `categories` AS `category` ON `category`.`id` = `video_category`.`category_id`
WHERE video.title = 'John Mcane' OR category.description = 'Traditional'
The table videos_categories
has two lines and that's the problem.
id | video_id | category_id
1 1 1
1 1 2
I can make a count to my array in PHP but that's not correct. Any ideas of how can I solve this? Group by
didn't work.
COUNT(X)计算所遇到的X值的总数,这些值不为null,COUNT(DISTINCT X)应该为您提供所需的值(假设X是唯一字段)。
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