mysql - 获取我的标 checkout 现在 mysql 查询中的计数

Question

SELECT det.tag_id,det.category_id,det.subcategory_id,det.event_id,dt.tag_name 
FROM `do_experience_tags` det
INNER JOIN `do_category` dc ON (det.subcategory_id=dc.`category_id` AND dc.is_master_category=1)
INNER JOIN do_tags dt ON (det.tag_id=dt.tag_id)

tagid   catid       subcatid   event_id     tag_name
174      4           25         2           #music
174      4           25         1           #music

如何获取新列中相同标签名的个数

Answer 1

使用count函数:

SELECT det.tag_id, count(*) 
  FROM `do_experience_tags` det
  INNER JOIN `do_category` dc ON    
  (det.subcategory_id=dc.`category_id` AND     
  dc.is_master_category=1)
  INNER JOIN do_tags dt ON (det.tag_id=dt.tag_id)
 GROUP BY det.tag_id