MySQL Solution with Explanation
Intuition\n Describe your first thoughts on how to solve this problem. \nWe need to calculate the daily total minutes spent by each employee at the office, cons
# Intuition\n<!-- Describe your first thoughts on how to solve this problem. -->\nWe need to calculate the daily total minutes spent by each employee at the office, considering multiple entries and exits.\n\n# Approach\n<!-- Describe your approach to solving the problem. -->\n\n1. Select specific columns from the table.\n    > `AS` \u2192 This command renames a column with an alias.\n\n2. Calculate the total time spent by each employee on each day at the office.\n    > `SUM()` \u2192 This function returns the total sum of a numeric column.\n\n3. Group the results based on specific columns.\n    > `GROUP BY` \u2192 This command groups rows that have the same values into summary rows, typically to perform aggregate functions on them.\n\n# Complexity\n- Time complexity: $O(n)$\n<!-- Add your time complexity here, e.g. $$O(n)$$ -->\n`n` is the total number of rows in the table. This is because we process each row in the table once to calculate the total time for each employee on each day.\n\n# Code\n```\n# Write your MySQL query statement below\nSELECT event_day AS day, emp_id, SUM(out_time - in_time) AS total_time\nFROM Employees\nGROUP BY day, emp_id\n```
['MySQL']