Subqueries are powerful Specially beats Self JOIN
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```mysql []\n# Write your MySQL query statement below\nSELECT product_id, year as first_year, quantity,price\nFROM Sales\nWHERE (product_id,year) in (\nSELECT product_id,MIN(year)\nFROM Sales\nGROUP BY product_id\n)\n\n\n\n```
['MySQL']