Question

Allow for last week or month being in previous year

Asked by: markhoy

Hello,

i have to select information for yesterday, today, tomorrow,
week to date, last week, month to date, last month

I have the basic SQL but am getting a bit lost in allowing for last week being in a different year to this; same for the month.

ie if I am running the sql on the 1st January 2004, last month is dec 2003

My SQL is below. Am I  approaching it all wrong or does it need a small tweak? A m I better to sue BEWTEEN and calc values for end of last week, start of last week, start of this week, end of last month, start of last month (using a full dd-mm-yyyy value)?

Thanks,

Mark


SELECT @yesterday = COUNT(*)
FROM MS_RBM..Bookings rbm
WHERE CONVERT(CHAR(12),StartDate,103) = CONVERT(CHAR(12),dbo.mDate(getdate(), -1),103)

SELECT @today = COUNT(*)
FROM MS_RBM..Bookings rbm
WHERE CONVERT(CHAR(12),StartDate,103) =  CONVERT(CHAR(12),dbo.mDate(getdate(), 0),103)

SELECT @tomorrow = COUNT(*)
FROM MS_RBM..Bookings rbm
WHERE CONVERT(CHAR(12),StartDate,103)=  CONVERT(CHAR(12),dbo.mDate(getdate(), 1),103)

-- this week
SELECT startDate ,DatePart(wk,getdate()-7) ,StartDate,
DatePart(wk,getdate())
FROM MS_RBM..Bookings rbm
WHERE DatePart(wk,StartDate) = DatePart(wk,getdate())

--last week
SELECT startDate ,DatePart(wk,getdate()-7) ,StartDate,
DatePart(wk,getdate())
FROM MS_RBM..Bookings rbm
WHERE DatePart(wk,StartDate) = DatePart(wk,getdate()-7)
?? year

--this month
SELECT startDate ,DatePart(m,getdate()),DatePart(yy,getdate()),DatePart(m,StartDate),
DatePart(m,getdate())
FROM MS_RBM..Bookings rbm
WHERE DatePart(m,StartDate) = DatePart(m,getdate())
AND DatePart(yy,StartDate) = DatePart(yy,getdate())


--last month
SELECT startDate ,DatePart(m,dateadd(month,-2, getdate())),DatePart(m,StartDate)
FROM MS_RBM..Bookings rbm
WHERE DatePart(m,StartDate) = DatePart(m,dateadd(month,-1, getdate()))
-- year??

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Asked On
2004-02-23 at 02:48:40ID20894448
Tags

dateadd

,

sql

,

getdate

,

last

Topic

MS SQL Server

Participating Experts
1
Points
250
Comments
9

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Answers

 

by: SashPPosted on 2004-02-23 at 03:34:49ID: 10431311

Hi Mark

Firstly you may speed up your SQL by removing some of the conversions from the code.

SELECT @yesterday = COUNT(*)
FROM MS_RBM..Bookings rbm
WHERE CONVERT(CHAR(12),StartDate,103) = CONVERT(CHAR(12),dbo.mDate(getdate(), -1),103)

Will should execute faster as

declare @Today datetime
set @Today = getdate()

SELECT @yesterday = COUNT(*)
FROM MS_RBM..Bookings rbm
WHERE datediff(dd,@Today,StartDate) = -1

You can put the getdate() in the SELECT statement but it is good practice to set your constants outside

Now the next couple of commands follow on

SELECT @today= COUNT(*)
FROM MS_RBM..Bookings rbm
WHERE datediff(dd,@Today,StartDate) = 0

SELECT @tomorrow= COUNT(*)
FROM MS_RBM..Bookings rbm
WHERE datediff(dd,@Today,StartDate) = 1

The last week is similar
SELECT @thisweek = COUNT(*)
FROM MS_RBM..Bookings rbm
WHERE datediff(wk,@Today,StartDate) = 0

Last Week
SELECT @lastweek= COUNT(*)
FROM MS_RBM..Bookings rbm
WHERE datediff(wk,@Today,StartDate) = -1

This month
SELECT @thismonth= COUNT(*)
FROM MS_RBM..Bookings rbm
WHERE datediff(mm,@Today,StartDate) = 0

Last Month
SELECT @lastmonth= COUNT(*)
FROM MS_RBM..Bookings rbm
WHERE datediff(mm,@Today,StartDate) = -1

The function datediff will remove the necessity of working out the month or year.

Sash



 

by: markhoyPosted on 2004-02-23 at 03:37:16ID: 10431333

give me 15 mins to try it out. thanks :-)

 

by: markhoyPosted on 2004-02-23 at 03:42:24ID: 10431358

And I thought I was OK at SQL :-(

Thanks for that- I should have asked last  week and saved myself a few hours toil.

Mark

 

by: SashPPosted on 2004-02-23 at 03:52:22ID: 10431407

No problems Mark you were very close with the datepart you would have found it sooner rather than later.

Try to avoid converting dates to character type to make comparisons you will almost always force SQL to do a table scan and prevent it utilising its indexes.

Cheers Sash

 

by: markhoyPosted on 2004-02-24 at 08:01:54ID: 10441928

Hello,

can this be amended to only include working days (not weekends)?

If yes, anyway to also exclude public holidays (genius if you can do that)

I'll post points if you can :-)

Thanks,

Mark

 

by: SashPPosted on 2004-02-25 at 00:42:12ID: 10448584

Mark

Days of the week are fairly easy.

Please be aware that the function datediff and datepart will be effected by which day is set as the start of the week.  Sunday is the default but it can be changed using SET DATEFIRST

declare @today datetime
set @today = getdate()

SELECT @thismonth= COUNT(*)
FROM MS_RBM..Bookings rbm
WHERE datediff(mm,@Today,StartDate) = 0
and datepart(dw,StartDate) between 2 and 6

For the public holidays.

You could access the information from the web and integrate it into your database doing a web query, however you would need to find a reliable source for the query.

If the choice was mine I would gather the information once and populate a permenant database table with it.  The table may look like

create table PublicHoliday
   (
   CalendarDate smalldatetime primary key,
   Description varchar(50)
   )

your query would then be

SELECT @thismonth= COUNT(*)
FROM MS_RBM..Bookings rbm
WHERE datediff(mm,@Today,StartDate) = 0
and datepart(dw,StartDate) between 2 and 6
and cast(convert(varchar(11),StartDate,106) as smalldatetime) not in (select CalendarDate from PublicHoliday)

I know this is not exactly what you asked for but should provide a satisfactory result as long as you are able to add the PublicHoliday table to your database.

Cheers Sash

 

by: markhoyPosted on 2004-02-25 at 01:11:01ID: 10448724

Hello,

I had to get some code going yesterday so opened another Q:

http://www.experts-exchange.com/Databases/Microsoft_SQL_Server/Q_20896406.html

 

by: markhoyPosted on 2004-02-25 at 01:50:55ID: 10448913

but having looked at them all, yours is the easiest to read and actually use

 

by: SashPPosted on 2004-02-25 at 02:01:19ID: 10448958

Thanks Mark

20120131-EE-VQP-002

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