Calendar Table in SQL Server - sql

Question

I am trying to create a Calendar Table with following columns and requirements. I have this calendar table made previously and I am not able to update it to my current requirements.
Date
Week No
Week Name
Week Start Date
Week End Date
Month
Month Start Date
Month End Date
List item
Quarter
Quarter Start Date
Quarter End Date
Year
Requirements
--Week Starts from Sunday and ends at Saturday
--Week Name should be in format 31Aug--to--06Sep
--Month should be ending date of Week's Month
--Calendar should start from 2015-08-31
--Financial Year should be in format of FY16-17
--Year should start from 1-Jun Till 31 May
--Quarter should be of 3 months of above mentioned dates
--Week No should be incremental number should not get reset after year completion.
The Query
DECLARE #StartDate date = '20150831'
DECLARE #CutoffDate date = '20300101'
;WITH seq(n) AS
(
SELECT 0 UNION ALL SELECT n + 1 FROM seq
WHERE n < DATEDIFF(DAY, #StartDate, #CutoffDate)
),
d(d) AS
(
SELECT DATEADD(DAY, n, #StartDate) FROM seq
),
src AS /*SOURCE TABLE WITH OBJECT DEFINITION*/
(
SELECT
TheDate = CONVERT(date, d),
TheDay = DATEPART(DAY, d),
TheDayName = DATENAME(WEEKDAY, d),
TheWeek = DATEPART(WEEK, d),
TheDayOfWeek = DATEPART(WEEKDAY, d),
TheMonth = DATEPART(MONTH, d),
TheMonthName = DATENAME(MONTH, d),
TheQuarter = Concat('Q',DATEPART(Quarter, d)),
Financial_Year = DATEPART(YEAR, d),
Financial_Quarter=Datepart(QUARTER,d),
TheYear = DATEPART(YEAR, d),
TheFirstOfMonth = DATEFROMPARTS(YEAR(d), MONTH(d), 1),
TheFirstOfFYear = DATEFROMPARTS(YEAR(d), 4, 1),
TheFirstOfYear = DATEFROMPARTS(YEAR(d), 1, 1),
TheLastOfYear = DATEFROMPARTS(YEAR(d), 12, 31),
TheDayOfYear = DATEPART(DAYOFYEAR, d)
FROM d
),
Dimension AS
(
SELECT
TheDate,
TheDay,
TheDayName,
TheDayOfWeek,
-- TheDayOfWeekInMonth = CONVERT(tinyint, ROW_NUMBER() OVER
-- (PARTITION BY TheFirstOfMonth, TheDayOfWeek ORDER BY TheDate)),
TheDayOfYear,
TheWeek,
TheFirstOfWeek = DATEADD(DAY, 1 - TheDayOfWeek, TheDate),
TheLastOfWeek = DATEADD(DAY, 6, DATEADD(DAY, 1 - TheDayOfWeek, TheDate)),
TheMonth,
TheMonthName,
TheFirstOfMonth,
TheLastOfMonth = MAX(TheDate) OVER (PARTITION BY TheYear, TheMonth),
TheFirstOfNextMonth = DATEADD(MONTH, 1, TheFirstOfMonth),
TheLastOfNextMonth = DATEADD(DAY, -1, DATEADD(MONTH, 2, TheFirstOfMonth)),
TheQuarter,
TheFirstOfQuarter = MIN(TheDate) OVER (PARTITION BY TheYear, TheQuarter),
TheLastOfQuarter = MAX(TheDate) OVER (PARTITION BY TheYear, TheQuarter),
TheYear,
TheFirstOfYear = DATEFROMPARTS(TheYear, 1, 1),
TheFirstOfFYear = DATEFROMPARTS(TheYear, 4, 1),
TheLastOfYear,
MMYYYY = CONVERT(char(2), CONVERT(char(8), TheDate, 101))
+ CONVERT(char(4), TheYear),
Financial_Quarter = Datepart(Quarter,DATEADD(MONTH, -3, TheFirstOfMonth)), /*Starting Financial Quarter from April*/
Financial_Year =CASE
WHEN Financial_Quarter = 1 THEN DATEPART(Year,Dateadd(Year,-1,TheFirstofYear)) ELSE THEYEAR END
FROM src
)
SELECT * FROM Dimension
ORDER BY TheDate
OPTION (MAXRECURSION 0);
How to convert Months depending on the weeks for example a month starts on Sunday (week also starts from Sunday) date be 01-MM-YYYY and the month should always end on Saturday giving 4 weeks normally in a month. The month cannot start or end with dates of previous week or month it should always have only the whole weeks, starting from Sunday and ending on Saturday.

Answer 1

As I mention in the comments, seems you just need a windowed COUNT. This is a guess, based on a lack of expected results, but this should get you on the right path. I also use the same set based method I used for your colleague's question:
DECLARE #StartDate date = '20150831'
DECLARE #CutoffDate date = '20300101';
/*
; is a terminator, not a "beginingator". It goes at the end of ALL your statements,
not at the start of statements that require the PREVIOUS statement to be properly terminated.
*/
WITH N AS
(SELECT N
FROM (VALUES (NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL)) N(N)),
Tally AS
(SELECT 0 AS I
UNION ALL
SELECT TOP (DATEDIFF(DAY, #StartDate, #CutoffDate))
ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) AS I
FROM N N1,N N2,N N3, N N4), --Up to 1000 rows. Add more cross joins for more rows
D AS
(SELECT DATEADD(DAY, T.I, #StartDate) AS d
FROM Tally T),
Src AS /*SOURCE TABLE WITH OBJECT DEFINITION*/
(SELECT CONVERT(date, d) AS TheDate,
DATEPART(DAY, d) AS TheDay,
DATENAME(WEEKDAY, d) AS TheDayName,
DATEPART(WEEK, d) AS TheWeek,
DATEPART(WEEKDAY, d) AS TheDayOfWeek,
DATEPART(MONTH, d) AS TheMonth,
DATENAME(MONTH, d) AS TheMonthName,
CONCAT('Q', DATEPART(QUARTER, d)) AS TheQuarter,
DATEPART(YEAR, d) AS Financial_Year,
DATEPART(QUARTER, d) AS Financial_Quarter,
DATEPART(YEAR, d) AS TheYear,
DATEFROMPARTS(YEAR(d), MONTH(d), 1) AS TheFirstOfMonth,
DATEFROMPARTS(YEAR(d), 4, 1) AS TheFirstOfFYear,
DATEFROMPARTS(YEAR(d), 1, 1) AS TheFirstOfYear,
DATEFROMPARTS(YEAR(d), 12, 31) AS TheLastOfYear,
DATEPART(DAYOFYEAR, d) AS TheDayOfYear
FROM d),
Dimension AS
(SELECT TheDate,
TheDay,
TheDayName,
TheDayOfWeek,
CONVERT(tinyint, ROW_NUMBER() OVER (PARTITION BY TheFirstOfMonth, TheDayOfWeek ORDER BY TheDate)) AS TheDayOfWeekInMonth,
TheDayOfYear,
TheWeek,
DATEADD(DAY, 1 - TheDayOfWeek, TheDate) AS TheFirstOfWeek,
DATEADD(DAY, 6, DATEADD(DAY, 1 - TheDayOfWeek, TheDate)) AS TheLastOfWeek,
CONVERT(tinyint, DENSE_RANK() OVER (PARTITION BY TheYear, TheMonth ORDER BY TheWeek)) AS TheWeekOfMonth,
TheMonth,
TheMonthName,
TheFirstOfMonth,
MAX(TheDate) OVER (PARTITION BY TheYear, TheMonth) AS TheLastOfMonth,
DATEADD(MONTH, 1, TheFirstOfMonth) AS TheFirstOfNextMonth,
DATEADD(DAY, -1, DATEADD(MONTH, 2, TheFirstOfMonth)) AS TheLastOfNextMonth,
TheQuarter,
MIN(TheDate) OVER (PARTITION BY TheYear, TheQuarter) AS TheFirstOfQuarter,
MAX(TheDate) OVER (PARTITION BY TheYear, TheQuarter) AS TheLastOfQuarter,
TheYear,
DATEFROMPARTS(TheYear, 1, 1) AS TheFirstOfYear,
DATEFROMPARTS(TheYear, 4, 1) AS TheFirstOfFYear,
TheLastOfYear,
CONVERT(char(2), CONVERT(char(8), TheDate, 101)) + CONVERT(char(4), TheYear) AS MMYYYY,
DATEPART(QUARTER, DATEADD(MONTH, -3, TheFirstOfMonth)) AS Financial_Quarter, /*Starting Financial Quarter from April*/
CASE
WHEN Financial_Quarter = 1 THEN DATEPART(YEAR, DATEADD(YEAR, -1, TheFirstOfYear))
ELSE TheYear
END AS Financial_Year,
COUNT(CASE WHEN DATENAME(WEEKDAY,TheDate) = 'Sunday' THEN 1 END) OVER (PARTITION BY YEAR(TheDate), MONTH(TheMonth) ORDER BY TheDate) AS TheWeekNo
FROM src)
SELECT *
FROM Dimension
ORDER BY TheDate;

Answer 2

Here is a single SELECT query that uses the WITH RECURSIVE statement. It does not require loops procedures etc.
A RECURSIVE SQL common table expression (CTE) is a query that continuously references a previous result until it returns an empty result. It's achieved using a CTE, which in SQL is known as a “WITH” statement.
In the query below, the second date_range with statement has a UNION ALL. The first query in that statement is the first record of the table, and the subsequent records are all from the UNION ALL second statement where it continuously references itself until it reaches the end_date, as expresses as "WHERE next_date <= end_date"
WITH RECURSIVE min_max_dates AS (
SELECT
MIN(start_at) start_date,
MAX(end_at) end_date
FROM table_or_hard_code ay
),
date_range AS (
select
start_date date,
DATE_TRUNC('month', start_date) month_date,
MONTH(start_date) as month_num,
YEAR(start_date) as month_year,
TO_CHAR((start_date),'MMMM') as month_display,
MONTHNAME (start_date) as month_short_display,
CONCAT(TO_CHAR((start_date),'MMMM'), ', ', YEAR(start_date)) as month_year_display,
DATEADD(DAY, 1, start_date) as next_date,
start_date,
end_date
FROM min_max_dates
UNION ALL
SELECT
dr.next_date date,
DATE_TRUNC('month', dr.next_date) month_date,
MONTH(dr.next_date) as month_num,
YEAR(dr.next_date) as month_year,
TO_CHAR((dr.next_date),'MMMM') as month_display,
MONTHNAME (dr.next_date) as month_short_display,
CONCAT(TO_CHAR((dr.next_date),'MMMM'), ', ', YEAR(dr.next_date)) as month_year_display,
DATEADD(DAY, 1, dr.next_date) as next_date,
start_date,
end_date
FROM date_range dr
WHERE next_date <= end_date
)
SELECT date, month_date, month_year, month_num, month_display, month_short_display, month_year_display
FROM date_range