Использование GETDATE для заполнения столбца в SQL

Question

У меня есть таблица размеров (как часть массива данных) с полем DateTime, называемым «Date». Я бы хотел получить дополнительную информацию из Date, поэтому я добавил дополнительные поля для номера месяца, дня и т. Д. (Эти дополнительные поля в настоящее время не заполнены.)

Это мой SQL, который пытается для заполнения «MonthNumber» с номером месяца. Однако это не работает. Может ли кто-нибудь указать мне в правильном направлении здесь, я беден в SQL.

SELECT GETDATE() 'Date', MONTH(GETDATE()) 'MonthNumber' 
FROM DimDate; 

Answer 1

Скорее всего, вы просите системный календарь, который будет использоваться в вашем DWH/BI или аналогичном решении. Тогда есть много рабочих примеров через Интернет. Просто Google для «системного календаря SQL Server», и вы найдете много примеров. Существует копирования/вставки из другого вопроса: similiar question

CREATE SCHEMA Auxiliary 
-- We put our auxiliary tables and stuff in a separate schema 
-- One of the great new things in SQL Server 2005 
go 

CREATE FUNCTION Auxiliary.Computus 
-- Computus (Latin for computation) is the calculation of the date of 
-- Easter in the Christian calendar 
-- http://en.wikipedia.org/wiki/Computus 
-- I'm using the Meeus/Jones/Butcher Gregorian algorithm 
(
    @Y INT -- The year we are calculating easter sunday for 
) 
RETURNS DATETIME 
AS 
BEGIN 
DECLARE 
@a INT, 
@b INT, 
@c INT, 
@d INT, 
@e INT, 
@f INT, 
@g INT, 
@h INT, 
@i INT, 
@k INT, 
@L INT, 
@m INT 

SET @a = @Y % 19 
SET @b = @Y/100 
SET @c = @Y % 100 
SET @d = @b/4 
SET @e = @b % 4 
SET @f = (@b + 8)/25 
SET @g = (@b - @f + 1)/3 
SET @h = (19 * @a + @b - @d - @g + 15) % 30 
SET @i = @c/4 
SET @k = @c % 4 
SET @L = (32 + 2 * @e + 2 * @i - @h - @k) % 7 
SET @m = (@a + 11 * @h + 22 * @L)/451 
RETURN(DATEADD(month, ((@h + @L - 7 * @m + 114)/31)-1, cast(cast(@Y AS VARCHAR) AS Datetime)) + ((@h + @L - 7 * @m + 114) % 31)) 
END 
GO 


CREATE TABLE [Auxiliary].[Calendar] (
-- This is the calendar table 
    [Date] datetime NOT NULL, 
    [Year] int NOT NULL, 
    [Quarter] int NOT NULL, 
    [Month] int NOT NULL, 
    [Week] int NOT NULL, 
    [Day] int NOT NULL, 
    [DayOfYear] int NOT NULL, 
    [Weekday] int NOT NULL, 
    [Fiscal_Year] int NOT NULL, 
    [Fiscal_Quarter] int NOT NULL, 
    [Fiscal_Month] int NOT NULL, 
    [KindOfDay] varchar(10) NOT NULL, 
    [Description] varchar(50) NULL, 
    PRIMARY KEY CLUSTERED ([Date]) 
) 
GO 

ALTER TABLE [Auxiliary].[Calendar] 
-- In Celkoish style I'm manic about constraints (Never use em ;-)) 
-- http://www.celko.com/ 

ADD CONSTRAINT [Calendar_ck] CHECK ( ([Year] > 1900) 
AND ([Quarter] BETWEEN 1 AND 4) 
AND ([Month] BETWEEN 1 AND 12) 
AND ([Week] BETWEEN 1 AND 53) 
AND ([Day] BETWEEN 1 AND 31) 
AND ([DayOfYear] BETWEEN 1 AND 366) 
AND ([Weekday] BETWEEN 1 AND 7) 
AND ([Fiscal_Year] > 1900) 
AND ([Fiscal_Quarter] BETWEEN 1 AND 4) 
AND ([Fiscal_Month] BETWEEN 1 AND 12) 
AND ([KindOfDay] IN ('HOLIDAY', 'SATURDAY', 'SUNDAY', 'BANKDAY'))) 
GO 




SET DATEFIRST 1; 
-- I want my table to contain datedata acording to ISO 8601 
-- http://en.wikipedia.org/wiki/ISO_8601 
-- thus first day of a week is monday 
WITH Dates(Date) 
-- A recursive CTE that produce all dates between 1999 and 2020-12-31 
AS 
(
SELECT cast('1999' AS DateTime) Date -- SQL Server supports the ISO 8601 format so this is an unambigious shortcut for 1999-01-01 
UNION ALL       -- http://msdn2.microsoft.com/en-us/library/ms190977.aspx 
SELECT (Date + 1) AS Date 
FROM Dates 
WHERE 
Date < cast('2021' AS DateTime) -1 
), 

DatesAndThursdayInWeek(Date, Thursday) 
-- The weeks can be found by counting the thursdays in a year so we find 
-- the thursday in the week for a particular date 
AS 
(
SELECT 
Date, 
CASE DATEPART(weekday,Date) 
WHEN 1 THEN Date + 3 
WHEN 2 THEN Date + 2 
WHEN 3 THEN Date + 1 
WHEN 4 THEN Date 
WHEN 5 THEN Date - 1 
WHEN 6 THEN Date - 2 
WHEN 7 THEN Date - 3 
END AS Thursday 
FROM Dates 
), 

Weeks(Week, Thursday) 
-- Now we produce the weeknumers for the thursdays 
-- ROW_NUMBER is new to SQL Server 2005 
AS 
(
SELECT ROW_NUMBER() OVER(partition by year(Date) order by Date) Week, Thursday 
FROM DatesAndThursdayInWeek 
WHERE DATEPART(weekday,Date) = 4 
) 
INSERT INTO Auxiliary.Calendar 
SELECT 
d.Date, 
YEAR(d.Date) AS Year, 
DATEPART(Quarter, d.Date) AS Quarter, 
MONTH(d.Date) AS Month, 
w.Week, 
DAY(d.Date) AS Day, 
DATEPART(DayOfYear, d.Date) AS DayOfYear, 
DATEPART(Weekday, d.Date) AS Weekday, 

-- Fiscal year may be different to the actual year in Norway the are the same 
-- http://en.wikipedia.org/wiki/Fiscal_year 
YEAR(d.Date) AS Fiscal_Year, 
DATEPART(Quarter, d.Date) AS Fiscal_Quarter, 
MONTH(d.Date) AS Fiscal_Month, 

CASE 
-- Holidays in Norway 
-- For other countries and states: Wikipedia - List of holidays by country 
-- http://en.wikipedia.org/wiki/List_of_holidays_by_country 
    WHEN (DATEPART(DayOfYear, d.Date) = 1)   -- New Year's Day 
    OR (d.Date = Auxiliary.Computus(YEAR(Date))-7) -- Palm Sunday 
    OR (d.Date = Auxiliary.Computus(YEAR(Date))-3) -- Maundy Thursday 
    OR (d.Date = Auxiliary.Computus(YEAR(Date))-2) -- Good Friday 
    OR (d.Date = Auxiliary.Computus(YEAR(Date))) -- Easter Sunday 
    OR (d.Date = Auxiliary.Computus(YEAR(Date))+39) -- Ascension Day 
    OR (d.Date = Auxiliary.Computus(YEAR(Date))+49) -- Pentecost 
    OR (d.Date = Auxiliary.Computus(YEAR(Date))+50) -- Whitmonday 
    OR (MONTH(d.Date) = 5 AND DAY(d.Date) = 1)  -- Labour day 
    OR (MONTH(d.Date) = 5 AND DAY(d.Date) = 17)  -- Constitution day 
    OR (MONTH(d.Date) = 12 AND DAY(d.Date) = 25) -- Cristmas day 
    OR (MONTH(d.Date) = 12 AND DAY(d.Date) = 26) -- Boxing day 
    THEN 'HOLIDAY' 
    WHEN DATEPART(Weekday, d.Date) = 6 THEN 'SATURDAY' 
    WHEN DATEPART(Weekday, d.Date) = 7 THEN 'SUNDAY' 
    ELSE 'BANKDAY' 
END KindOfDay, 
CASE 
-- Description of holidays in Norway 
    WHEN (DATEPART(DayOfYear, d.Date) = 1)   THEN 'New Year''s Day' 
    WHEN (d.Date = Auxiliary.Computus(YEAR(Date))-7) THEN 'Palm Sunday' 
    WHEN (d.Date = Auxiliary.Computus(YEAR(Date))-3) THEN 'Maundy Thursday' 
    WHEN (d.Date = Auxiliary.Computus(YEAR(Date))-2) THEN 'Good Friday' 
    WHEN (d.Date = Auxiliary.Computus(YEAR(Date))) THEN 'Easter Sunday' 
    WHEN (d.Date = Auxiliary.Computus(YEAR(Date))+39) THEN 'Ascension Day' 
    WHEN (d.Date = Auxiliary.Computus(YEAR(Date))+49) THEN 'Pentecost' 
    WHEN (d.Date = Auxiliary.Computus(YEAR(Date))+50) THEN 'Whitmonday' 
    WHEN (MONTH(d.Date) = 5 AND DAY(d.Date) = 1)  THEN 'Labour day' 
    WHEN (MONTH(d.Date) = 5 AND DAY(d.Date) = 17)  THEN 'Constitution day' 
    WHEN (MONTH(d.Date) = 12 AND DAY(d.Date) = 25) THEN 'Cristmas day' 
    WHEN (MONTH(d.Date) = 12 AND DAY(d.Date) = 26) THEN 'Boxing day' 
END Description 

FROM DatesAndThursdayInWeek d 
-- This join is for getting the week into the result set 
    inner join Weeks w 
    on d.Thursday = w.Thursday 

OPTION(MAXRECURSION 0) 
GO 

CREATE FUNCTION Auxiliary.Numbers 
(
@AFrom INT, 
@ATo INT, 
@AIncrement INT 
) 
RETURNS @RetNumbers TABLE 
(
[Number] int PRIMARY KEY NOT NULL 
) 
AS 
BEGIN 
WITH Numbers(n) 
AS 
(
SELECT @AFrom AS n 
UNION ALL 
SELECT (n + @AIncrement) AS n 
FROM Numbers 
WHERE 
n < @ATo 
) 
INSERT @RetNumbers 
SELECT n from Numbers 
OPTION(MAXRECURSION 0) 
RETURN; 
END 
GO 

CREATE FUNCTION Auxiliary.iNumbers 
(
@AFrom INT, 
@ATo INT, 
@AIncrement INT 
) 
RETURNS TABLE 
AS 
RETURN(
WITH Numbers(n) 
AS 
(
SELECT @AFrom AS n 
UNION ALL 
SELECT (n + @AIncrement) AS n 
FROM Numbers 
WHERE 
n < @ATo 
) 
SELECT n AS Number from Numbers 
) 
GO