RANK()  function MYSQL
Intuition\n Describe your first thoughts on how to solve this problem. \n\n# Approach\n Describe your approach to solving the problem. \n\n# Complexity\n- Time 
# Intuition\n<!-- Describe your first thoughts on how to solve this problem. -->\n\n# Approach\n<!-- Describe your approach to solving the problem. -->\n\n# Complexity\n- Time complexity:\n<!-- Add your time complexity here, e.g. $$O(n)$$ -->\n\n- Space complexity:\n<!-- Add your space complexity here, e.g. $$O(n)$$ -->\n\n# Code\n```\n# Write your MySQL query statement below\nSELECT product_id, year as first_year, quantity, price\nFROM (\n    SELECT product_id, year, quantity, price,\n    RANK() OVER (PARTITION BY product_id ORDER BY year) AS r\n    FROM Sales\n)t\nWHERE r = 1;\n```
['MySQL']