Very easy MySQL soln
Very easy solution\n\n# Code\n\nselect event_day as day,emp_id,sum(out_time-in_time) as total_time\nfrom Employees\ngroup by day,emp_id\n
# Very easy solution\n\n# Code\n```\nselect event_day as day,emp_id,sum(out_time-in_time) as total_time\nfrom Employees\ngroup by day,emp_id\n```
['MySQL']