mysql3表查询

Question

【star明星表】
id name
有N多明星，自增id
【sing歌曲表】
id name star_id
N多歌曲
【movie电影表】
id name star_id
N多电影

查询每个明星一共有多少歌曲多少电影
name cout_sing count_movie

Answer 1

正确的mysql语句

SELECT a.name, (

SELECT COUNT( * ) 
FROM sing AS s
WHERE a.id = s.star_id
) AS singcount, (

SELECT COUNT( * ) 
FROM movie AS c
WHERE a.id = c.star_id
) AS moviecount
FROM star AS a
LIMIT 0 , 30

Answer 2

select conut(tb1.id) as singnum
from star as tb3
left join sing as tb1 on tb1.starid=tb3.id
where tb3.id=somenoe