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query to count repating alphabet in a string Expand / Collapse
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Posted Friday, September 21, 2012 8:00 AM
Grasshopper

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U Nailed It..
Post #1362681
Posted Thursday, October 4, 2012 11:32 PM


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ChrisM@Work (9/21/2012)
Big hammer;

DECLARE @asd VARCHAR(20)
SET @asd = 'asdaaaadffa'

SELECT
Letter,
Occurrences = COUNT(*)
FROM (
SELECT Letter = SUBSTRING(@asd,n,1)
FROM (SELECT TOP(LEN(@asd)) n = ROW_NUMBER() OVER (ORDER BY (SELECT NULL))
FROM sys.all_columns) tally
) d
GROUP BY Letter
ORDER BY Occurrences DESC



I'm guessing the OP will get an A+ on this homework assignment.



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!
Post #1368824
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