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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...
How to understand Locality Sensitive Hashing?
... a set of documents/images/objects and outputs a kind of Hash Table.
The indexes of this table contain the documents such that documents that are on the same index are considered similar and those on different indexes are "dissimilar".
Where similar depends on the metric system and also on a thr...
How to get overall CPU usage (e.g. 57%) on Linux [closed]
...edited Oct 17 '19 at 17:48
Mike Q
4,50411 gold badge3737 silver badges5151 bronze badges
answered Feb 10 '12 at 14:48
...
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 to delete from a text file, all lines that contain a specific string?
...o sed as in sed -i '/pattern to match/d' ./infile. Note that the -i flag requires GNU sed and is not portable
– SiegeX
Mar 23 '11 at 20:16
16
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How do you create a transparent demo screen for an Android app?
...ck.
The first 2 define the opacity: 00 is 100% transparent, ff is 100% opaque. So choose something in between.
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How to move git repository with all branches from bitbucket to github?
...tbucket to github then for 5 branches it is shown as "Compare and Pull Request" in github. It is not shown as branches in github. What can I do about it?
– Siddharth
Jul 6 '14 at 2:55
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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 ...
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 :=...
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...