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How can I add a column that doesn't allow nulls in a Postgresql database?
... "NOT NULL" column to my Postgresql database using the following query (sanitized for the Internet):
8 Answers
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How can I Remove .DS_Store files from a Git repository?
How can I remove those annoying Mac OS X .DS_Store files from a Git repository?
25 Answers
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How can I use inverse or negative wildcards when pattern matching in a unix/linux shell?
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In Bash you can do it by enabling the extglob option, like this (replace ls with cp and add the target directory, of course)
~/foobar> shopt extglob
extglob off
~/foobar> ls
abar afoo bbar bfoo
~/foobar> ls !(b*)
-bash: !: e...
How to get the first item from an associative PHP array?
... array if you have an element inside the array:
$value = reset($array);
It also gives you FALSE in case the array is empty.
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How does Python manage int and long?
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int and long were "unified" a few versions back. Before that it was possible to overflow an int through math ops.
3.x has further advanced this by eliminating long altogether and only having int.
Python 2: sys.maxint contains the maximum value a Python int can hold.
On a 64-bit Py...
SQL WHERE ID IN (id1, id2, …, idn)
I need to write a query to retrieve a big list of ids.
9 Answers
9
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Effect of NOLOCK hint in SELECT statements
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1) Yes, a select with NOLOCK will complete faster than a normal select.
2) Yes, a select with NOLOCK will allow other queries against the effected table to complete faster than a normal select.
Why would this be?
NOLOCK typically (dependin...
C++ templates that accept only certain types
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I suggest using Boost's static assert feature in concert with is_base_of from the Boost Type Traits library:
template<typename T>
class ObservableList {
BOOST_STATIC_ASSERT((is_base_of<List, T>::value)); //Yes, the double parentheses are needed, otherwise the comma ...
How to debug Visual Studio extensions
I'm just writing a VSIX extension for Visual Studio 2010 and can't figure out how to debug it.
4 Answers
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Can overridden methods differ in return type?
...rn type is assignable to the return type of the method you are overriding, it's allowed.
For example:
class ShapeBuilder {
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public Shape build() {
....
}
class CircleBuilder extends ShapeBuilder{
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@Override
public Circle build() {
....
}
This is specified in se...