SQL to find time elapsed from multiple overlapping intervals

Question

Not using MSSQL or DB2 or Oracle. No CTE. No OVERLAP predicate. No INTERVAL data type. The situation: on a vehicle to be repaired work can not start until all parts orde

Answer 1

USE [DnnMasterShoraSystem]
GO
/****** Object:  StoredProcedure [dbo].[CalculateHoldTimes]    Script Date: 12/8/2014 1:36:12 PM ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO

ALTER PROCEDURE [dbo].[CalculateHoldTimes]
    @PID int    
AS
BEGIN      
CREATE TABLE #tblTemp(
    [ID] [int] NOT NULL,
    [PID] [int] NOT NULL,
    [BID] [int] NOT NULL,
    [Active] [bit] NULL,
    [WorkStartDate] [nvarchar](10) NULL,
    [WorkEndDate] [nvarchar](10) NULL,
    [jobStateID] [int] NULL,
    [RegisterType] [int] NULL,
    [RegisterState] [int] NULL,
    [En_time] [datetime] NULL,
    [Fa_time] [nvarchar](40) NULL,
    [Status] [nvarchar](100) NULL,
    [PortalId] [int] NULL,
    [ModuleId] [int] NULL,
    [UserId] [int] NULL,
    [BrName] [nvarchar](150) NULL,
    [BrCode] [nvarchar](20) NULL,
    [WorkEndDate_New] [nvarchar](10) NULL
) ON [PRIMARY]

insert into #tblTemp
select * from [dbo].[Shora.Personel_Branch_Copy] 
        where WorkStartDate is not null 
        --and [dbo].[ShamsiToMiladi](WorkStartDate) @Period_End
        begin
            set @Period_Start=@SDate            

            if @Period_End>=@Period_Start
            set @Total+=DATEDIFF(DAY,@Period_Start,@Period_End)
        end
    else if @SDate<@Period_End
        begin       
        set @Period_Start=@Period_Start     
            set @Total=DATEDIFF(DAY,@Period_Start,@Period_End)
        end

        set @OldSDate=@SDate 
        set @OldEDate=@EDate

        FETCH NEXT FROM Events
        INTO @SDate, @EDate;

        if  @Period_End<@EDate
        set @Period_End=@EDate

    END;

INSERT INTO [dbo].[PersonelDays]
           (PID
           ,[Total_Start]
           ,[Total_End]
           ,[Total_count])
     VALUES
           (@PID,           
            @Period_Start,
            @Period_End,
            @Total
           )

drop table #tblTemp
CLOSE Events
DEALLOCATE Events
END;