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PostgreSQL: How to pass parameters from command line?
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Note, upon reading this I hoped to find that variables set with -v would be available to commands executed with -c, but, alas they are not. In other words, psql -v v1=12 -v v2="'Hello World'" -v v3="'2010-11-12'" -c 'select * from t...
How to Sign an Already Compiled Apk
...ou don't have to sign with the original keystore, just generate a new one. Read up on the details: http://developer.android.com/guide/publishing/app-signing.html
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How to select lines between two marker patterns which may occur multiple times with awk/sed
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@Brendan the instruction //!b reads if the current line is neither one of the lines that match the range, break and therefore print those lines otherwise all other lines are deleted.
– potong
Feb 17 '17 at 1:14
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How does a hash table work?
...again when you need them.
So, you decide that if the person that wants to read a book knows the title of the book and the exact title to boot, then that's all it should take. With the title, the person, with the aid of the librarian, should be able to find the book easily and quickly.
So, how can ...
Filtering for empty or NULL names in a queryset
... using NULL values for string-based fields such as CharField or TextField. Read the documentation for the explanation:
https://docs.djangoproject.com/en/dev/ref/models/fields/#null
Solution:
You can also chain together methods on QuerySets, I think. Try this:
Name.objects.exclude(alias__isnull=Tr...
Is there a null-coalescing (Elvis) operator or safe navigation operator in javascript?
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Well, it's hard to read but it's better than that verbose && method. +1.
– shriek
Sep 15 '16 at 21:06
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Check if an array is empty or exists
... array.length > 0) because if array is null we'll get TypeError: Cannot read property 'length' of null.
– Pooyan Khosravi
May 9 '14 at 20:56
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When would I use XML instead of SQL? [closed]
... others. XML is the "lingua franca" of the Web -- just about everyone can read and interpret it, unlike a database file.
2) When your data volume is small and you don't have to do complex queries against it. XML files are good for things like storing configuration or document templates.
3) W...
How to append to a file in Node?
...s.write is not recommended in this case, use fs.createWriteStream instead. Read nodejs.org/docs/v0.4.8/api/all.html#fs.write
– angry kiwi
Jun 27 '11 at 9:33
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Can CSS force a line break after each word in an element?
...se newly proposed width values, provided those still exist by the time you read this.
div {
width: min-intrinsic; /* old Chrome, Safari */
width: -webkit-min-content; /* less old Chrome, Safari */
width: -moz-min-content; /* current Firefox */
width: min-content; /*...