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Quirky Update in SQL 2012 Expand / Collapse
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Posted Saturday, October 6, 2012 3:22 AM
SSCrazy

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All,

is the "Quirky Update" hole is still open in sql 2012 shop too? or is there any patch applied to close the hole?

if yes, what is the workaround for this? I remember Jeff mentioned in one of his interview this was closed. But i am not sure.




karthik
Post #1369400
Posted Saturday, October 6, 2012 9:41 AM


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karthik M (10/6/2012)
All,

is the "Quirky Update" hole is still open in sql 2012 shop too? or is there any patch applied to close the hole?

if yes, what is the workaround for this? I remember Jeff mentioned in one of his interview this was closed. But i am not sure.




Wayne Sheffield wrote a great blog article on it including some performance testing.
http://blog.waynesheffield.com/wayne/archive/2011/08/running-totals-in-denali-ctp3/

The "new" method for doing running totals is still slower than the Quirky Update method but not by a whole lot. Better than that, the new method is supported by MicroSoft which helps people avoid that queazy feeling they get when they don't understand something.


--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."

(play on words) "Just because you CAN do something in T-SQL, doesn't mean you SHOULDN'T." --22 Aug 2013

Helpful Links:
How to post code problems
How to post performance problems
Post #1369439
Posted Tuesday, September 10, 2013 7:37 AM
Grasshopper

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Although the new functionality may help with running total, it does not help when trying to roll through a table being able to update a row based on values from the previous row. In other words, anything not aggregate based. Using the TransactionDetail example if I needed to calculate the daily and running performance from one day to the next, I would need to use the formula (Amount - YesterdayAmount) / YesterdayAmount to calculate each rows daily performance. QuirkyUpdate is the only viable/speedy way that I have found to do this.
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