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Beräkna förfallodatum med hjälp av öppettider och helgdagar

Du behöver en tabell med giltiga öppettider, med helger och helgdagar undantagna (eller markerade som helg/helgdag så att du kan hoppa över dem.) Varje rad representerar en dag och antalet arbetstimmar för den dagen. Sedan frågar du tabellen över öppettider från ditt startdatum till det första (min) datumet där summan (timmar*60) är större än din minutparameter, exklusive markerade helg-/helgrader. Det ger dig ditt slutdatum.

Här är dagtabellen:

CREATE TABLE [dbo].[tblDay](
    [dt] [datetime] NOT NULL,
    [dayOfWk] [int] NULL,
    [dayOfWkInMo] [int] NULL,
    [isWeekend] [bit] NOT NULL,
    [holidayID] [int] NULL,
    [workingDayCount] [int] NULL,
 CONSTRAINT [PK_tblDay] PRIMARY KEY CLUSTERED 
(
    [dt] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]

så här fyller jag i tabellen med dagar:

CREATE PROCEDURE [dbo].[usp_tblDay]
AS
BEGIN
    SET NOCOUNT ON;
    DECLARE  
        @Dt datetime ,
        @wkInMo int,
        @firstDwOfMo int,
        @holID int,
        @workDayCount int,
        @weekday int,
        @month int,
        @day int,
        @isWkEnd bit

    set @workDayCount = 0
    SET @Dt = CONVERT( datetime, '2008-01-01' ) 
    while @dt < '2020-01-01'
    begin
        delete from tblDay where dt = @dt

        set @weekday = datepart( weekday, @Dt )
        set @month = datepart(month,@dt)
        set @day = datepart(day,@dt)

        if @day = 1  -- 1st of mo
            begin
                set @wkInMo = 1
                set @firstDwOfMo = @weekday
            end

        if ((@weekday = 7) or (@weekday = 1)) 
            set @isWkEnd = 1 
        else 
            set @isWkEnd = 0

        if @isWkEnd = 0 and (@month = 1 and @day = 1) 
            set @holID=1        -- new years on workday
        else if @weekday= 6 and (@month = 12 and @day = 31) 
            set @holID=1        -- holiday on sat, change to fri
        else if @weekday= 2 and (@month = 1 and @day = 2) 
            set @holID=1        -- holiday on sun, change to mon

        else if @wkInMo = 3 and @weekday= 2 and @month = 1 
            set @holID = 2      -- mlk

        else if @wkInMo = 3 and @weekday= 2 and @month = 2 
            set @holID = 3      -- President’s

        else if @wkInMo = 4 and @weekday= 2 and @month = 5 and datepart(month,@dt+7) = 6
            set @holID = 4      -- memorial on 4th mon, no 5th
        else if @wkInMo = 5 and @weekday= 2 and @month = 5 
            set @holID = 4      -- memorial on 5th mon

        else if @isWkEnd = 0 and (@month = 7 and @day = 4) 
            set @holID=5        -- July 4 on workday
        else if @weekday= 6 and (@month = 7 and @day = 3) 
            set @holID=5        -- holiday on sat, change to fri
        else if @weekday= 2 and (@month = 7 and @day = 5) 
            set @holID=5        -- holiday on sun, change to mon

        else if @wkInMo = 1 and @weekday= 2 and @month = 9 
            set @holID = 6      -- Labor

        else if @isWkEnd = 0 and (@month = 11 and @day = 11) 
            set @holID=7        -- Vets day on workday
        else if @weekday= 6 and (@month = 11 and @day = 10) 
            set @holID=7        -- holiday on sat, change to fri
        else if @weekday= 2 and (@month = 11 and @day = 12) 
            set @holID=7        -- holiday on sun, change to mon

        else if @wkInMo = 4 and @weekday= 5 and @month = 11 
            set @holID = 8      -- thx

        else if @holID = 8
            set @holID = 9      -- dy after thx

        else if @isWkEnd = 0 and (@month = 12 and @day = 25) 
            set @holID=10       -- xmas day on workday
        else if @weekday= 6 and (@month = 12 and @day = 24) 
            set @holID=10       -- holiday on sat, change to fri
        else if @weekday= 2 and (@month = 12 and @day = 26) 
            set @holID=10       -- holiday on sun, change to mon
        else
            set @holID = null

        insert into tblDay select @dt,@weekday,@wkInMo,@isWkEnd,@holID,@workDayCount

        if @isWkEnd=0 and @holID is null 
            set @workDayCount = @workDayCount + 1

        set @dt = @dt + 1
        if datepart( weekday, @Dt ) = @firstDwOfMo 
            set @wkInMo = @wkInMo + 1
    end
END

Jag har också ett semesterbord, men allas helgdagar är olika:

holidayID   holiday rule description
1   New Year's Day  Jan. 1
2   Martin Luther King Day  third Mon. in Jan.
3   Presidents' Day third Mon. in Feb.
4   Memorial Day    last Mon. in May
5   Independence Day    4-Jul
6   Labor Day   first Mon. in Sept
7   Veterans' Day   Nov. 11
8   Thanksgiving    fourth Thurs. in Nov.
9   Fri after Thanksgiving  Friday after Thanksgiving
10  Christmas Day   Dec. 25

HTH



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