MySQL Solution for Group Sold Products By The Date Problem
Intuition\n Describe your first thoughts on how to solve this problem. \nThe intuition behind the solution is to group the activities by sell date and then calc
# Intuition\n<!-- Describe your first thoughts on how to solve this problem. -->\nThe intuition behind the solution is to group the activities by sell date and then calculate the number of different products sold on each date. Additionally, we need to concatenate the names of the products and sort them lexicographically for each sell date.\n\n# Approach\n<!-- Describe your approach to solving the problem. -->\nThe approach is to use the SQL query provided, which utilizes the GROUP BY clause to group the activities by sell date. Within each group, the COUNT(DISTINCT product) function is used to count the number of different products sold, while the GROUP_CONCAT(DISTINCT product ORDER BY product) function is used to concatenate and sort the product names lexicographically.\n\n# Complexity\n- Time complexity:\n<!-- Add your time complexity here, e.g. $$O(n)$$ -->\nThe time complexity of this solution depends on the number of rows in the Activities table. Let\'s denote this number as n. The query performs a grouping operation, which typically has a time complexity of O(n log n) or O(n) depending on the database implementation. Additionally, the query involves sorting the product names lexicographically for each sell date, which also contributes to the overall time complexity.\n\n- Space complexity:\n<!-- Add your space complexity here, e.g. $$O(n)$$ -->\nThe space complexity of this solution depends on the number of distinct sell dates and the number of distinct products. Let\'s denote these numbers as d and p respectively. The space complexity is O(d + p), as it requires storing the distinct sell dates and the distinct product names in memory for grouping and concatenation operations.\n\n# Code\n```\n# Write your MySQL query statement below\nSELECT sell_date, COUNT(DISTINCT product) AS num_sold, GROUP_CONCAT(DISTINCT product ORDER BY product) AS products\nFROM Activities\nGROUP BY sell_date\nORDER BY sell_date;\n\n```
['MySQL']