What is a simple and efficient way to find rows with time-interval overlaps in SQL?

Question

I have two tables, both with start time and end time fields. I need to find, for each row in the first table, all of the rows in the second table where the time intervals in

Answer 1

"solutions from other platforms may be of interest also."

SQL Standard defines OVERLAPS predicate:

Specify a test for an overlap between two events.

 ::=
     OVERLAPS  

Example:

SELECT 1
WHERE ('2020-03-01'::DATE, '2020-04-15'::DATE) OVERLAPS 
      ('2020-02-01'::DATE, '2020-03-15'::DATE) 
-- 1

db<>fiddle demo