MySQL多表關聯查詢數量



//多表關聯查詢數量
select user, t1.count1, t2.count2
from user t
left join (
select user_id, count(sport_type) as count1
from sport group by user_id
) t1
on t.id = t1.user_id
left join (
select user_id, count(level) as count2
from grade group by user_id
) t2
on t.id = t2.user_id
order by t.id


免責聲明!

本站轉載的文章為個人學習借鑒使用,本站對版權不負任何法律責任。如果侵犯了您的隱私權益,請聯系本站郵箱yoyou2525@163.com刪除。



 
粵ICP備18138465號   © 2018-2025 CODEPRJ.COM