LC 1336. Number of Transactions per Visit
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select t3.id as transactions_count, if(t5.cnt is null,0,t5.vcnt) as visits_count from ( select t0.id from ( select @num:=@num+1 as id from (select @num:=-1) p, Transactions union select 0 as id # Transactions maybe null )t0 join ( select max(cnt) as mx from ( select v.user_id, v.visit_date, count(t.amount) as cnt from Visits v left join Transactions t on v.user_id=t.user_id and v.visit_date=t.transaction_date group by v.user_id, v.visit_date )t1 )t2 where t0.id<=t2.mx )t3 # t3: left column 0--max left join ( select cnt, count(*) as vcnt from ( select v.user_id, v.visit_date, count(t.amount) as cnt from Visits v left join Transactions t on v.user_id=t.user_id and v.visit_date=t.transaction_date group by v.user_id, v.visit_date )t4 group by cnt )t5 on t3.id=t5.cnt
标签:LC,Transactions,1336,num,user,date,id,select 来源: https://www.cnblogs.com/FEIIEF/p/12421934.html