check Record (Slot) is already exists between Start and End time in SQL Server

-
 In this  article I will show you how to  check Record is already exists between Start and End time .
I have a table ,its having start and end time column with 3 rows(or it may be n of rows).so i am putting here my SQL query to get those records if any record  have time between Start and end time .

DECLARE @mytable as Table
(
    StartTime time,
    EndTime time
)

INSERT INTO @mytable VALUES
('08:00', '08:30'),
('10:30', '12:30'),
('12:30', '14:15')

DECLARE @StartTime time, @EndTime time

SELECT  @StartTime = '14:15',
        @EndTime = '18:15'

  SELECT *
FROM @mytable
WHERE
(
    StartTime < @EndTime
    AND EndTime > CASE WHEN @StartTime > @EndTime THEN '00:00' ELSE @StartTime END
)
OR
(

    @StartTime > @EndTime
    AND StartTime > EndTime
)
OR
(
    @StartTime < @EndTime
    AND StartTime > EndTime
    AND EndTime > @StartTime      
)


Note : I have taken is considertion that the time peroid might inlcude two diffrent days.you can filter it by adding new paramter as current selected date

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