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mock sql2 first commit #11

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2 changes: 2 additions & 0 deletions Customers_who_bought_all_products.sql
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--Write your MySQL query statement below
select customer_id from customer group by customer_id having count(distinct product_key) = (select count(product_key) from product);
4 changes: 4 additions & 0 deletions Product_sales_analysis_iii.sql
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--Write your MySQL query statement below
with cte as (select distinct product_id , min(year) over (partition by product_id) as 'first_year' from sales )
select s.product_id, s.year as 'first_year', s.quantity, s.price from sales s inner join cte c on c.product_id = s.product_id and s.year = c.first_year