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What are the best practices for using a GUID as a primary key, specifically regarding performance?
...ly bad performance.
Yes, I know - there's newsequentialid() in SQL Server 2005 and up - but even that is not truly and fully sequential and thus also suffers from the same problems as the GUID - just a bit less prominently so.
Then there's another issue to consider: the clustering key on a table w...
Check if passed argument is file or directory in Bash
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answered Aug 26 '17 at 20:44
KamranKamran
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Programmatically fire button click event?
...n it is not possible without synthesizing the touch. See cocoawithlove.com/2008/10/…. However, you cannot submit your app to the App Store using this method, as it uses a private API. It is normally used for debugging purposes.
– Evan Mulawski
Apr 11 '11 at 1...
When should I use File.separator and when File.pathSeparator?
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edited Sep 27 '12 at 20:12
Adam
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answere...
Recommended website resolution (width and height)? [closed]
...- not screen size
More about responsive design:
Responsive Web Design (2010, May 25), Ethan Marcotte, A List Apart.
Responsive Web Design at Wikipedia
Multi-device layout patterns (2012, Mar 14) Luke Wroblewski. Catalogs the most popular patterns for adaptable multi-device screen layouts.
Tool...
LINQ - Convert List to Dictionary with Value as List
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edited Nov 20 '12 at 15:15
answered Aug 23 '10 at 15:40
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How to call a method after a delay in Android
...ert Christopher
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answered Feb 6 '12 at 19:55
kontinuitykontinuity
22.5k33 go...
Go to back directory browsing after opening file in vim
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203
You can go back to the last buffer using :b#.
If you just opened a file, then it will bring ...
How to calculate date difference in JavaScript?
...yicktoofay
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Best way to simulate “group by” from bash?
...e the $1, $2, $3, $4 according to your requirements )
cat file
US|A|1000|2000
US|B|1000|2000
US|C|1000|2000
UK|1|1000|2000
UK|1|1000|2000
UK|1|1000|2000
awk 'BEGIN { FS=OFS=SUBSEP="|"}{arr[$1,$2]+=$3+$4 }END {for (i in arr) print i,arr[i]}' file
US|A|3000
US|B|3000
US|C|3000
UK|1|9000
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