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Add a reference column migration in Rails 4
... Active Record only supports single column foreign keys and currently only mysql, mysql2 and PostgreSQL adapters are supported. Don't try this with other adapters like sqlite3, etc. Refer to Rails Guides: Foreign Keys for your reference.
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Why are joins bad when considering scalability?
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...except in MySQL, which seems to have performance problems with large numbers of joins regardless of how your indexes look. Or at least it has in the past.
– Powerlord
Apr 12 '10 at 17:53
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npm throws error without sudo
... (npm link, npm install -g, etc.).
You probably ran node installation with root permissions, that's why the global package installation is asking you to be root.
Solution 1: NVM
Don't hack with permissions, install node the right way.
On a development machine, you should not install and run node ...
How to use count and group by at the same select statement
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needs alias otherwise wouldnt work in mysql. select count(*) from( ) agr
– amas
Jan 9 '14 at 6:54
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Cmake doesn't find Boost
...older. I have specified Boost_INCLUDE_DIR , Boost_LIBRARYDIR and BOOST_ROOT , but I still get an error saying that CMake is not able to find Boost. What could be the reason of such error?
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Compiling Java 7 code via Maven
...ystem/Library/Frameworks/JavaVM.framework/Versions/
total 64
lrwxr-xr-x 1 root wheel 10 30 Oct 16:18 1.4 -> CurrentJDK
lrwxr-xr-x 1 root wheel 10 30 Oct 16:18 1.4.2 -> CurrentJDK
lrwxr-xr-x 1 root wheel 10 30 Oct 16:18 1.5 -> CurrentJDK
lrwxr-xr-x 1 root wheel 10 30 Oct 16:1...
How can I detect if the user is on localhost in PHP?
...n.
I think what you remember with PHPMyAdmin is something different: Many MySQL Servers are configured so that they can only be accessed from localhost for security reasons.
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ORA-00979 not a group by expression
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@AaronDigulla That's what MySQL does, and the world didn't end :p
– Chris Baker
Aug 27 '14 at 21:32
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Relative URLs in WordPress
... and found the core ticket #17048: URLs delivered to the browser should be root-relative. Where we can find the reasons explained by Andrew Nacin, lead core developer. He also links to this [wp-hackers] thread. On both those links, these are the key quotes on why WP doesn't use relative URLs:
Core ...
Numpy `logical_or` for more than two arguments
...or function takes no more than two arrays to compare. How can I find the union of more than two arrays? (The same question could be asked with regard to Numpy's logical_and and obtaining the intersection of more than two arrays.)
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