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Finding duplicate values in MySQL
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Do a SELECT with a GROUP BY clause. Let's say name is the column you want to find duplicates in:
SELECT name, COUNT(*) c FROM table GROUP BY name HAVING c > 1;
This will return a result with the name value in the first ...
how perform grep operation on all files in a directory
... "grep -r $PATTERN ." is sufficient. For recursive grep you do not need to specify all files
– Cougar
Oct 2 '13 at 6:26
1
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How do you make a WPF slider snap only to discrete integer positions?
All too often I want a WPF slider that behaves like the System.Windows.Forms.TrackBar of old. That is, I want a slider that goes from X to Y but only allows the user to move it in discrete integer positions.
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Best practices for API versioning? [closed]
...different API versions in parallel by using source control systems that predominantly work on files as the smallest unit of (source code) versioning.
However, with API versions clearly visible in URI there's a caveat: one might also object this approach since API history becomes visible/aparent in ...
Entity Framework VS LINQ to SQL VS ADO.NET with stored procedures? [closed]
...Framework ("EF") - it now generates much better SQL (more like Linq to SQL does) and is easier to maintain and more powerful than Linq to SQL ("L2S"). As of the release of .NET 4.0, I consider Linq to SQL to be an obsolete technology. MS has been very open about not continuing L2S development furt...
How to limit UITableView row reordering to a section
...ragging a cell) outside of allowed section?
– Palimondo
Apr 8 '12 at 14:49
1
In Xamarin, the wrap...
Mac zip compress without __MACOSX folder?
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When I had this problem I've done it from command line:
zip file.zip uncompressed
EDIT, after many downvotes: I was using this option for some time ago and I don't know where I learnt it, so I can't give you a better explanation. Chris Johnson's answer...
What is “android:allowBackup”?
... a fuller explanation than just what is in the one line error message; you don't have to search the web for more info.
If you are using lint via Eclipse, either open the lint warnings view, where you can select the lint error and see a longer explanation, or invoke the quick fix (Ctrl-1) on the err...
Element-wise addition of 2 lists?
... - in python3, map() returns an iterable thingy rather than a list. If you do need an actual list, the first answer is list(map(add, list1, list2))
– FLHerne
Mar 24 '16 at 11:25
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How do I negate a test with regular expressions in a bash script?
... the path because "/usr/bin" is already there).
– Gordon Davisson
Dec 28 '10 at 0:54
It took me a while to understand ...