1741. Find Total Time Spent by Each Employee

Table: Employees +-------------+------+ | Column Name | Type | +-------------+------+ | emp_id | int | | event_day | date | | in_time | int | | out_time | int | +-------------+------+ (emp_id, event_day, in_time) is the primary key (combinations of columns with unique values) of this table. The table shows the employees' entries and exits in an office. event_day is the day at which this event hap