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Filtering for empty or NULL names in a queryset
...lias (optional) which I need to search for. So, I need a query to give me all the names that have an alias set.
7 Answers
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Two single-column indexes vs one two-column index in MySQL?
... "MySQL can use multiple-column indexes for queries that test all the columns in the index, or queries that test just the first column, the first two columns, the first three columns, and so on. If you specify the columns in the right order in the index definition, a single composite in...
Is there something like Annotation Inheritance in java?
...do with programs that read the annotations on a class without loading them all the way. See Why is it not possible to extend annotations in Java?
However, types do inherit the annotations of their superclass if those annotations are @Inherited.
Also, unless you need those methods to interact, you...
How to get first N elements of a list in C#?
...many C# versions later. For the specific case where you have a list. Especially if you are skipping many items. E.g. you have a list of one million items, and you want a slice of 5 of them, far into the list. GetRange knows exactly where to go to grab them. I don't know whether Skip + Take is as sma...
What is the best way to do a substring in a batch file?
...ion) of the currently running batch file (unless executed in a subroutine called by call). The complete list of such “special” substitutions for path names can be found with help for, at the very end of the help:
In addition, substitution of FOR
variable references has been enhanced.
You...
Maven project.build.directory
...org/apache/maven/model
There you'll find the pom-4.0.0.xml.
It contains all those "short cuts":
<project>
...
<build>
<directory>${project.basedir}/target</directory>
<outputDirectory>${project.build.directory}/classes</outputDirectory>...
What's the bad magic number error?
...the pyc file or trying to run a pyc from a different version of python (usually later) than your interpreter.
If they are your pyc files, just delete them and let the interpreter re-compile the py files. On UNIX type systems, that could be something as simple as:
rm *.pyc
or:
find . -name '*.py...
Git submodule add: “a git directory is found locally” issue
I'm actually trying to learn how to use git, including the git submodule subcommands.
I already set up a server on which I can host, push and pull git repositories by using SSH.
I created a main git repository "Travail" on this server in which I would like to put all my projects as submodules.
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REST response code for invalid data
...HTTP authentication, 401 is not appropriate.
– Greg Ball
May 9 '12 at 3:41
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How to install a node.js module without using npm?
...e but are not published with the npm-registry. These modules can't be installed using npm.
5 Answers
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