Total orders by new customers Each day and week

Question

I'm fairly new to SQL and I'm trying get total orders by new customers every day and each week in Mysql ( feel free to answer in any sql versions). First I tried to get total orders by new customers every day by writing below query, however Im getting incorrect results.

select COUNT(u.orderId), date(u.createdAt) as ord_dt, u.userId
from userorder u 
    inner join
        (
            select userId, min(date(createdAt)) as first_date
            from userorder 
            group by 1
        ) g 
        on g.userId =  u.userId
where g.first_date < date(u.createdAt)
group by 3

Link to the dataset https://docs.google.com/spreadsheets/d/1fA6hAkDJgp28BF0G0aSe9Ml64S9cIwch/edit?usp=sharing&ouid=104686423957654811582&rtpof=true&sd=true

Any help is appreciated

Answer 1

I wrote this query to get the daily answer.

select first_order_date,  sum(first_total_order) as tot from
      (select user_id,min(order_date) as first_order_date,total_order as 
        first_total_order
         from
          (select userId as user_id,date(createdAt) as order_date,count(orderId) 
            as total_order
              from userorder
              group by 1,2
             ) as uo
        group by 1) z
  group by 1;