Saurv (1/4/2013)
Bhuvnesh,
CROSS APPLY (VALUES(High, 'High', DATEPART(dw, CAST(DateID AS CHAR(8))))
,(Low, 'Low', DATEPART(dw, CAST(DateID AS CHAR(8))))) a (Val, Type, weekday)
GROUP BY CompanyName, Type
is similar to
CROSS APPLY (select High as val , 'High' as Type , DATEPART(dw, CAST(DateID AS CHAR(8))) as Weekday
union all
select Low as val, 'Low' as Type , DATEPART(dw, CAST(DateID AS CHAR(8)))
) a
GROUP BY CompanyName, Type
Hope you understood..
Thanks,
Saurabh
I believe that CAV offers a higher degree of potential parallelization. Read the discussion thread on the article for more information on that.
My thought question: Have you ever been told that your query runs too fast?
My advice:
INDEXing a poor-performing query is like putting sugar on cat food. Yeah, it probably tastes better but are you sure you want to eat it?
The path of least resistance can be a slippery slope. Take care that fixing your fixes of fixes doesn't snowball and end up costing you more than fixing the root cause would have in the first place.
Need to UNPIVOT? Why not CROSS APPLY VALUES instead?[/url]
Since random numbers are too important to be left to chance, let's generate some![/url]
Learn to understand recursive CTEs by example.[/url]
[url url=http://www.sqlservercentral.com/articles/St