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What are the most common SQL anti-patterns? [closed]
...Human readable password fields, egad. Self explanatory.
Using LIKE against indexed
columns, and I'm almost tempted to
just say LIKE in general.
Recycling SQL-generated PK values.
Surprise nobody mentioned the
god-table yet. Nothing says
"organic" like 100 columns of bit
flags, large strings and inte...
Beginner's guide to ElasticSearch [closed]
...wed this guide to help me set it up (it worked fine on all three distros)
Index and types
One Index can contain many types, it's by using types that you can achieve a good degree of separation of data that belongs within the same index.
PHP
I use PHP as a front end and used this wrapper to integ...
How to generate a random string of a fixed length in Go?
...s is a string constant.)
And at what cost? Nothing at all. strings can be indexed which indexes its bytes, perfect, exactly what we want.
Our next destination looks like this:
const letterBytes = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
func RandStringBytes(n int) string {
b :=...
Delete column from pandas DataFrame
...df = df.drop(df.columns[[0, 1, 3]], axis=1) # df.columns is zero-based pd.Index
Also working with "text" syntax for the columns:
df.drop(['column_nameA', 'column_nameB'], axis=1, inplace=True)
Note: Introduced in v0.21.0 (October 27, 2017), the drop() method accepts index/columns keywords as an ...
Why won't my PHP app send a 404 error?
...
if (strstr($_SERVER['REQUEST_URI'],'index.php')){
header('HTTP/1.0 404 Not Found');
echo "<h1>404 Not Found</h1>";
echo "The page that you have requested could not be found.";
exit();
}
If you look at the last two echo lines, that'...
How many files can I put in a directory?
...lesystem in use on the Linux server. Nowadays the default is ext3 with dir_index, which makes searching large directories very fast.
So speed shouldn't be an issue, other than the one you already noted, which is that listings will take longer.
There is a limit to the total number of files in one d...
What is the ideal data type to use when storing latitude / longitude in a MySQL database?
...
FYI; Mysql support spatial index only with *.myisam tables, i.e. the ISAM engine. Link: dev.mysql.com/doc/refman/5.0/en/creating-spatial-indexes.html
– PodTech.io
Jan 15 '17 at 5:46
...
What does $1 [QSA,L] mean in my .htaccess file?
...s ^(.+)$ (matches any URL except the server root), it will be rewritten as index.php?url=$1 which means a request for ollewill be rewritten as index.php?url=olle).
QSA means that if there's a query string passed with the original URL, it will be appended to the rewrite (olle?p=1 will be rewritten a...
Deleting Files using Git/GitHub
...h <filepattern> against files in the working tree in addition to the index. That means that it will find new files as well as staging modified content and removing files that are no longer in the working tree."
– j08691
Jul 18 '12 at 20:33
...
How to overlay one div over another div
...ght: 100%;
position: absolute;
top: 0;
left: 0;
}
#infoi {
z-index: 10;
}
<div id="container">
<div id="navi">a</div>
<div id="infoi">
<img src="https://appharbor.com/assets/images/stackoverflow-logo.png" height="20" width="32" />b
</div...