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Need T-SQL optimization Help


Need T-SQL optimization Help

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vignesh.ms
vignesh.ms
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Hi There,

Following is the sample data ,

DECLARE @maxval int, @minval int
select @maxval=201301,@minval=201312

SELECT top 100001 CAST(((@maxval + 1) - @minval) *
RAND(CHECKSUM(NEWID())) + @minval AS int)Date ,ceiling (RAND(CHECKSUM(NEWID())) *1000+25692*RAND(CHECKSUM(NEWID())) )*ceiling (RAND(CHECKSUM(NEWID())) *1000+25692*RAND(CHECKSUM(NEWID())) )ID
into #sample from sysobjects , syscolumns



Problem :
* there are 2 columns date & id
* take first month id's , say for example 201302
* need to find whether those id's are available or not, in the next 3 months. so here 201303,201304,201305
* need to repeat this for all months

Here is the my code, It requires more manual intervention and time taking. Please assist.


select distinct date from #sample order by DATE

declare @processingdate varchar(6),@from varchar(6),@to varchar(6)
set @processingdate = '201302'
set @from = '201303'
set @to = '201305'


select distinct id into #Source from #sample where DATE = @processingdate
select distinct id into #lookup from #sample where DATE between @from and @to

select @processingdate,count(*) from #Source where ID not in (select * from #lookup)




Thanks
Jeff Moden
Jeff Moden
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To be honest, whomever designed the table with an integer representation of year and month did a great disservice to anyone and everyone using the table and it's going to be a real bugger when the year roles over. Are you allowed to change the datatype of that column?

--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.
Although they tell us that they want it real bad, our primary goal is to ensure that we dont actually give it to them that way.
Although change is inevitable, change for the better is not.
Just because you can do something in PowerShell, doesnt mean you should. Wink

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j.miner
j.miner
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I agree with Jeff that a date should be stored as a date in the source system (OLTP). I would try to change it. However, I know how hard it is sometimes to get buy in at the Business Level.

I have work on a few data warehouses (OLAP) in my time. One part of a star schema is a date dimension. Usually some number is given to a date. That number is used throughout the tables.

How about a date decode table that translates the 201301 (a number stored as a char(6)) to '2013-01-01' as a date. Thus, adding one more join to the equation allows you to work with dates.

I would check Aaron's article on handling dates.

http://sqlblog.com/blogs/aaron_bertrand/archive/2009/10/16/bad-habits-to-kick-mishandling-date-range-queries.aspx

I would keep away from BETWEEN.

Good luck ...

John Miner
Crafty DBA
www.craftydba.com
vignesh.ms
vignesh.ms
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Group: General Forum Members
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Jeff Moden (1/4/2014)
To be honest, whomever designed the table with an integer representation of year and month did a great disservice to anyone and everyone using the table and it's going to be a real bugger when the year roles over. Are you allowed to change the datatype of that column?



Yes I can change the datatype ... Its complex bet one time activity..
so I could ...
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