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Can I have multiple primary keys in a single table?
...hese practices, but there is nothing in the relational model that requires selecting a primary key among the candidate keys.
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Eclipse count lines of code
...e way to count lines of code in Eclipse:
using the Search / File... menu, select File Search tab, specify \n[\s]* for Containing text (this will not count empty lines), and tick Regular expression.
Hat tip: www.monblocnotes.com/node/2030
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Block Comments in a Shell Script
...ing to write active code to create passive code... just use good old block select mode and press #; what's the big issue with that?
– Rusty75
Feb 27 '17 at 15:37
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I do not want to inherit the child opacity from the parent in CSS
...ame, but defined exclusively (e.g. to overwrite the user agent styles of a select dropdown):
.parent {
background-color: rgba(0,0,0,0.5);
}
.child {
background-color: rgba(128,128,128,0);
}
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如何选择机器学习算法 - 大数据 & AI - 清泛网移动版 - 专注C/C++及内核技术
...aking sure to try different parameters within each algorithm as well), and select the best one by cross-validation. But if you’re simply looking for a “good enough” algorithm for your problem, or a place to start, here are some general guidelines I’ve found to work well over the year...
How to delete a character from a string using Python
...examples for both of the two major uses cases, separated by their position selection method.
– Alexander Stohr
Mar 17 at 15:29
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iOS Simulator failed to install the application
...had to remove folder ~/Library/Application Support/iPhone Simulator/6.0 (I selectively removed for 6.0 - other iOS versions were unaffected in my case).
– mklement0
Aug 2 '13 at 13:53
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Should we @Override an interface's method implementation?
...o do that right click on ur project-> properties-> Java compiler and select one that is higher than 1.5.
– Rose
Nov 14 '12 at 19:18
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How do I install the OpenSSL libraries on Ubuntu?
...b to see a list of matching package names (which can help when you need to select the correct version of a package that has multiple versions or other variations available).
Bash completion is actually very useful... for example, you can also get a list of commands that apt-get supports by typing s...
WAMP error: Forbidden You don't have permission to access /phpmyadmin/ on this server
...notification icon (in the task bar).
Single click on the WAMP server icon.
Select last option from the menu, that is, Put Online
Your server will restart automatically (in the latest versions only). Otherwise, you have to restart your server manually.
And you are DONE...
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