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Completed Mock_SQL2 #34

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22 changes: 21 additions & 1 deletion README.md
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# Mock_SQL2
# Mock_SQL2
Problem1: Customers Who Bought All Products(https://leetcode.com/problems/customers-who-bought-all-products/description/)
Solution:

Select c.customer_id
from Customer c
inner join Product p
on c.product_key = p.product_key
group by c.customer_id
having count(distinct c.product_key) = (select count(*) from Product)

Problem2: Product Sales Analysis |||(https://leetcode.com/problems/product-sales-analysis-iii/description/)
Solution:

SELECT product_id, year AS first_year, quantity, price
FROM Sales
WHERE (product_id, year) IN (
SELECT product_id, MIN(year) AS year
FROM Sales
GROUP BY product_id
);