Need SQL Function ?

Question

Need SQL Function ?

bala2013

SSChasing Mays

Points: 607
More actions
June 28, 2013 at 2:33 am

#275698

Dear all,
Hope things are going well at your end.
I need sql function for getting the following Scenarios:
Input parameter : ShiftDate
Need to create function for
Senario 1
1st day of the month – Till Date(Output:01-06-2013,02-06-2013,...28-06-2013)
Senario 2
1st day of the week – Till Day(week start date and end date)(23-06-2013,29-06-2013)
Senario 3
1st day of the year – Till Date(from 01-01-2013,02-01-2013,...01-02-2013,....28-06-2013)
please help on this?

Viewing 8 posts - 1 through 7 (of 7 total)

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HanShi SSC-Dedicated Points: 33507 More actions · Answer 1

Create a reference or tally table that holds all the dates of the period you need (i.e. 365 rows per year). Select the desired date range from this reference table with a simple SELECT and WHERE clause. You can JOIN the results with other tables when needed. You can also create a stored procedure (or TVF) from the code below.

DECLARE @ShiftDate date

SET @ShiftDate = '20130202'

SELECT datecolumn

FROM referencetable

WHERE datecolumn <= @ShiftDate

-- unmark the row below to get all dates from the first day of the year

--AND datecolumn >= CAST(YEAR(@ShiftDate) as CHAR(4)) + '0101'

-- unmark the row below to get all dates from the first day of the month

--AND datecolumn >= CAST(YEAR(@ShiftDate) as CHAR(4)) + RIGHT('00' + CAST(MONTH(@ShiftDate) as varchar(2)), 2) + '01'

-- unmark the row below to get all dates from the first day of the week

--AND datecolumn >= dateadd(day, -1 * (DATEPART(weekday, @ShiftDate))+1, @ShiftDate)

ORDER BY datecolumn

** Don't mistake the ‘stupidity of the crowd’ for the ‘wisdom of the group’! **

bala2013 SSChasing Mays Points: 607 More actions · Answer 2

bala2013

SSChasing Mays

Points: 607

June 28, 2013 at 3:48 am

#1628238

Thanks very much !

Sean Lange SSC Guru Points: 286590 More actions · Answer 3

In addition to using a tally/numbers table you might also want to take a look at this article from Lynn. It has a collection of excellent methods for finding certain dates.

http://www.sqlservercentral.com/blogs/lynnpettis/2009/03/25/some-common-date-routines/[/url]

_______________________________________________________________

Need help? Help us help you.

Read the article at http://www.sqlservercentral.com/articles/Best+Practices/61537/ for best practices on asking questions.

Need to split a string? Try Jeff Modens splitter http://www.sqlservercentral.com/articles/Tally+Table/72993/.

Cross Tabs and Pivots, Part 1 – Converting Rows to Columns - http://www.sqlservercentral.com/articles/T-SQL/63681/
Cross Tabs and Pivots, Part 2 - Dynamic Cross Tabs - http://www.sqlservercentral.com/articles/Crosstab/65048/
Understanding and Using APPLY (Part 1) - http://www.sqlservercentral.com/articles/APPLY/69953/
Understanding and Using APPLY (Part 2) - http://www.sqlservercentral.com/articles/APPLY/69954/

HanShi SSC-Dedicated Points: 33507 More actions · Answer 4

Hi Sean,

That's an interesting link. I've never thought of using the "0" in the DATEDIFF function, but it's an nice approach and consistent for the different dateparts (and therefor more readable).

** Don't mistake the ‘stupidity of the crowd’ for the ‘wisdom of the group’! **

Sean Lange SSC Guru Points: 286590 More actions · Answer 5

HanShi (6/28/2013)
Hi Sean,
That's an interesting link. I've never thought of using the "0" in the DATEDIFF function, but it's an nice approach and consistent for the different dateparts (and therefor more readable).

I can't take credit for it, that is all Lynn. But I frequently point people to that article because it works really well. 😉

_______________________________________________________________

Need help? Help us help you.

Read the article at http://www.sqlservercentral.com/articles/Best+Practices/61537/ for best practices on asking questions.

Need to split a string? Try Jeff Modens splitter http://www.sqlservercentral.com/articles/Tally+Table/72993/.

Cross Tabs and Pivots, Part 1 – Converting Rows to Columns - http://www.sqlservercentral.com/articles/T-SQL/63681/
Cross Tabs and Pivots, Part 2 - Dynamic Cross Tabs - http://www.sqlservercentral.com/articles/Crosstab/65048/
Understanding and Using APPLY (Part 1) - http://www.sqlservercentral.com/articles/APPLY/69953/
Understanding and Using APPLY (Part 2) - http://www.sqlservercentral.com/articles/APPLY/69954/

bala2013 SSChasing Mays Points: 607 More actions · Answer 6

very intersting link,very useful for me.thanks a lot!

Jeff Moden SSC Guru Points: 1004362 More actions · Answer 7

balamurugan.devadas (6/30/2013)
very intersting link,very useful for me.thanks a lot!

The next question would be... do you understand how all of those examples actually work? Your are, in fact, the one that's going to have to support whatever you write at least until it gets to production. 😉

--Jeff Moden

RBAR is pronounced "ree-bar" and is a "Modenism" for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
________Stop thinking about what you want to do to a ROW... think, instead, of what you want to do to a COLUMN.

Change is inevitable... Change for the better is not.

Helpful Links:
How to post code problems
How to Post Performance Problems
Create a Tally Function (fnTally)