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datediff producing erroneous result when datetime is between midnight and 1AM


datediff producing erroneous result when datetime is between midnight and 1AM

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dwain.c
dwain.c
SSCarpal Tunnel
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SELECT STUFF(CONVERT(VARCHAR(20),EndDT-StartDT,114),1,2,DATEDIFF(hh,0,EndDT-StartDT))




+1 to Jeff for that! Absolutely brilliant.


My mantra: No loops! No CURSORs! No RBAR! Hoo-uh!

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?
Since random numbers are too important to be left to chance, let's generate some!
Learn to understand recursive CTEs by example.
Splitting strings based on patterns can be fast!
My temporal SQL musings: Calendar Tables, an Easter SQL, Time Slots and Self-maintaining, Contiguous Effective Dates in Temporal Tables
Jeff Moden
Jeff Moden
SSC-Forever
SSC-Forever (45K reputation)SSC-Forever (45K reputation)SSC-Forever (45K reputation)SSC-Forever (45K reputation)SSC-Forever (45K reputation)SSC-Forever (45K reputation)SSC-Forever (45K reputation)SSC-Forever (45K reputation)

Group: General Forum Members
Points: 45066 Visits: 39904
dwain.c (10/15/2013)

SELECT STUFF(CONVERT(VARCHAR(20),EndDT-StartDT,114),1,2,DATEDIFF(hh,0,EndDT-StartDT))




+1 to Jeff for that! Absolutely brilliant.


Heh... thanks Dwain but, nah... not brilliant. Blush Just lazy. I hate typing long formulas... I make too many typing mistakes when they get long. :-P

--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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