Функция для нахождения временных интервалов

USE [oktell_cc_temp]
GO
/****** Object:  UserDefinedFunction [dbo].[AddTimeIntervals]    Script Date: 28.06.2019 9:42:08 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
-- =============================================
-- Author:      <Author,,Name>
-- Create date: <Create Date,,>
-- Description: <Description,,>
-- =============================================
ALTER FUNCTION [dbo].[AddTimeIntervals] (@idTask uniqueidentifier, @idOperator uniqueidentifier, @state int, @dateStart datetime, @timeStart datetime, @dateTimeStop datetime) RETURNS
    @returnTable TABLE(IdTask uniqueidentifier, IdOperator uniqueidentifier, [State] int, DateStart datetime, TimeStart datetime, DateTimeStop datetime, Interval nvarchar(20))
AS
BEGIN
    DECLARE @Start time
    DECLARE @End time

    SET @Start = @timeStart
    SET @End = CAST(@dateTimeStop as time)

    INSERT INTO @returnTable
    SELECT @idTask
    ,@idOperator
    ,@state
    ,@dateStart
    ,@timeStart
    ,@dateTimeStop
    ,[oktell_cc_temp].[dbo].[Time_Intervals_At_Day].Interval
    FROM [oktell_cc_temp].[dbo].[Time_Intervals_At_Day]
        WHERE (@Start >= TimeStart AND @Start <= TimeEnd)
              OR (@End >= TimeStart AND @End <= TimeEnd)
              OR (TimeStart >= @Start AND TimeEnd <= @End)

    RETURN;
END