SOLUTION WITH UNPIVOT TABLE ( SQL SERVER )
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```\nSELECT\n\tproduct_id,\n\tstore,\n\tprice\nFROM\n\tProducts\nUNPIVOT \n\t(\n\t\tprice FOR store IN (store1,store2,store3)\n\t)UNPIVOTTABLE\n```
['MS SQL Server']