Beginner friendly sql solution
\n# Write your MySQL query statement below\nselect \n    event_day as day, \n    emp_id, \n    sum(out_time - in_time) as total_time \nfrom Employees \ngroup by
```\n# Write your MySQL query statement below\nselect \n    event_day as day, \n    emp_id, \n    sum(out_time - in_time) as total_time \nfrom Employees \ngroup by event_day, emp_id;\n```
['MySQL']