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Hidden Features of MySQL
...threads_created do not grow very quickly.
PRIMARY KEY:
There can be only one AUTO_INCREMENT column per table, it must be indexed, and it cannot have a DEFAULT value
KEY is normally a synonym for INDEX. The key attribute PRIMARY KEY can also be specified as just KEY when given in a column definiti...
How to assign from a function which returns more than one value?
...;- functionReturningTwoValues()
If you only need the first or second component these all work too:
list[a] <- functionReturningTwoValues()
list[a, ] <- functionReturningTwoValues()
list[, b] <- functionReturningTwoValues()
(Of course, if you only needed one value then functionReturning...
PHP multidimensional array search by value
...Based on angoru answer. In later versions of PHP (>= 5.5.0) you can use one-liner.
$key = array_search('100', array_column($userdb, 'uid'));
Here is documentation: http://php.net/manual/en/function.array-column.php.
sh...
Can I specify multiple users for myself in .gitconfig?
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One command github accounts switch
This solution takes the form of a single git alias. Once executed, the current project user will be attached to another account
Generate ssh keys
ssh-keygen -t rsa -C "rinquin.arnaud@gmail.c...
Max or Default?
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One of the two overloads of DefaultIfEmpty is supported in LINQ to SQL - the one that doesn't take parameters.
– DamienG
Dec 5 '08 at 17:46
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How to clear the cache of nginx?
... server, I have modified the CSS files, but nginx is still serving the old ones.
22 Answers
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Markdown to create pages and table of contents?
...ate a table of contents to assist while editing.
There might also be the one or the other library, who can generate TOCs: see Python Markdown TOC Extension.
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Getting the IP address of the current machine using Java
...e lots of network interfaces, and an interface could be bound to more than one IP address. And to top that, not all IP addresses will be reachable outside of your machine or your LAN. For example, they could be IP addresses for virtual network devices, private network IP addresses, and so on.
Wha...
How can I reliably get an object's address when operator& is overloaded?
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Update: in C++11, one may use std::addressof instead of boost::addressof.
Let us first copy the code from Boost, minus the compiler work around bits:
template<class T>
struct addr_impl_ref
{
T & v_;
inline addr_impl_ref( T &...
Is there a difference between /\s/g and /\s+/g?
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\s means "one space", and \s+ means "one or more spaces".
But, because you're using the /g flag (replace all occurrences) and replacing with the empty string, your two expressions have the same effect.
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