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What do two question marks together mean in C#?
...e following statement will assign the first non-null Answer# to Answer (if all Answers are null then the Answer is null):
string Answer = Answer1 ?? Answer2 ?? Answer3 ?? Answer4;
Also it's worth mentioning while the expansion above is conceptually equivalent, the result of each expression is o...
INNER JOIN vs LEFT JOIN performance in SQL Server
... slower; by definition, an outer join (LEFT JOIN or RIGHT JOIN) has to do all the work of an INNER JOIN plus the extra work of null-extending the results. It would also be expected to return more rows, further increasing the total execution time simply due to the larger size of the result set.
(A...
What is the purpose of the '@' symbol in CSS?
...ructs. The @ syntax itself, though, as I mentioned, is not new.
These are all known in CSS as at-rules. They're special instructions for the browser, not directly related to styling of (X)HTML/XML elements in Web documents using rules and properties, although they do play important roles in control...
How to show the last queries executed on MySQL?
Is there any query/way to show the last queries executed on ALL servers?
10 Answers
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Recursively add files by pattern
...t doesn't provide any fancy mechanisms for doing this itself, as it's basically a shell problem: how do you get a list of files to provide as arguments to a given command.
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Xcode 5: Code signing entitlement errors
...both rows, however, I saw the "Any iOS SDK" subrows for each configuration all set to None, although the Debug/Release rows did list the proper profile/signing identity. Archiving in this state still gave me the error, until I explicitly set all the "Any iOS SDK" rows to their proper values.
...
Is it possible to read the value of a annotation in java?
...ation and if the annotation policy retains the annotation at runtime. Naturally if the retention policy doesn't keep the annotation at runtime, you won't be able to query it at runtime.
An answer that's since been deleted (?) provided a useful link to an annotations tutorial that you may find helpf...
How to drop a list of rows from Pandas dataframe?
...
this doesnt allow you to index on the index name itself
– ingrid
Nov 2 '16 at 20:33
47
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Remove directory which is not empty
...
There is a module for this called rimraf (https://npmjs.org/package/rimraf). It provides the same functionality as rm -Rf
Async usage:
var rimraf = require("rimraf");
rimraf("/some/directory", function () { console.log("done"); });
Sync usage:
rimr...
__FILE__ macro shows full path
....com/pipermail/cmake/2013-January/053117.html
I'm copying the tip so it's all on this page:
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -D__FILENAME__='\"$(subst
${CMAKE_SOURCE_DIR}/,,$(abspath $<))\"'")
If you're using GNU make, I see no reason you couldn't extend this to your own makefiles. ...