Basics of how to pull records that intersect a date range from a temporal (aka date-effective) database.
-- @rangeStart is the start of the date range of interest
-- @rangeEnd is the end of the date range of interest
-- If you use null to signify infinity, then use the commented line instead of the one above it.
-- Assumes both intervals are [Start, End), ie, start is inclusive, end is exclusive.
where StartDate < @rangeEnd
and EndDate > @rangeStart
-- and coalesce(endDate, '9999-12-31') > @rangeStart