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spliting nested string


spliting nested string

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David Burrows
David Burrows
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Or another (just for fun ;-) )


WITH SampleData (ID, MyString) AS
(
SELECT 1, '1:1,3,5,7,4:56,43,58,5:34,67r,234'
),
split AS
(
SELECT b.ItemNumber,b.Item
FROM SampleData a
CROSS APPLY dbo.DelimitedSplit8K(MyString, ',') b
)
SELECT LEFT(s2.Item,CHARINDEX(':',s2.Item)-1),
CASE CHARINDEX(':', s1.Item) WHEN 0 THEN s1.Item ELSE SUBSTRING(s1.Item,CHARINDEX(':', s1.Item)+1,255) END
FROM split s1
CROSS APPLY (SELECT TOP 1 * FROM split WHERE ItemNumber < s1.ItemNumber AND Item LIKE '%:%' ORDER BY ItemNumber DESC) s2



Really horrible looking execution plan though :-D


Far away is close at hand in the images of elsewhere.

Anon.


dwain.c
dwain.c
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Group: General Forum Members
Points: 18171 Visits: 6431
David Burrows (10/25/2013)


Clearly we are having way too much fun here! :-P


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
Go


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