sqlstud (1/8/2013)
dwain.c (1/8/2013)
Here are two ways:
WITH Filenames (fn) AS (
SELECT 'XX_YYYYY_AA_BBB_SampleTransaction_120807_55322.TXT'
UNION ALL SELECT 'XX_YYYYYY_DDD_MasterTransaction_120807_00005.TXT')
SELECT fn=SUBSTRING(fn, 1, CHARINDEX('.', fn))
FROM Filenames;
WITH Filenames (fn) AS (
SELECT 'XX_YYYYY_AA_BBB_SampleTransaction_120807_55322.TXT'
UNION ALL SELECT 'XX_YYYYYY_DDD_MasterTransaction_120807_00005.TXT')
SELECT fn=Item
FROM Filenames
CROSS APPLY PatternSplitCM(fn, '[0-9a-zA-Z_]')
WHERE [Matched] = 1 AND ItemNumber = 1;
The second uses PatternSplitCM, which is a general tool that can be used for this purpose, and is described in the 4th article in my signature (splitting strings on patterns). That article also shows how to split out other components of a file name.
Thanks dwain.c
using the first approach, the result is like
XX_YYYYY_AA_BBB_SampleTransaction_120807_55322.
XX_YYYYYY_DDD_MasterTransaction_120807_00005.
But i need the below output
XX_YYYYY_AA_BBB_SampleTransaction
XX_YYYYYY_DDD_MasterTransaction
Please suggest on this..
Regards
SqlStud
Sorry about that! Misread the requirement. Try this:
WITH Filenames (fn) AS (
SELECT 'XX_YYYYY_AA_BBB_SampleTransaction_120807_55322.TXT'
UNION ALL SELECT 'XX_YYYYYY_DDD_MasterTransaction_120807_00005.TXT')
SELECT fn=SUBSTRING(fn, 1, PATINDEX('%[0-9]%', fn)-2)
FROM Filenames;
The PatternSplitCM will work too (not as is) but it would need to be changed into something quite a bit more complicated.
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