How to determine if a date range occurs any time within another date range?

Question

I have an Event table that specifies a date range with start_date and end_date fields. I have another date range, specified in code, that defines the

Answer 1

In order...

where start_date >= week_start and end_date <= week_end
where start_date <= week_start and end_date >= week_start and end_date <= week_end
where start_date >= week_start and start_date <= week_end and end_date > week_end
where start_date < week_start and end_date > week_end