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Fast way to discover the row count of a table in PostgreSQL
... a table exists in a given schema
TABLESAMPLE SYSTEM (n) in Postgres 9.5+
SELECT 100 * count(*) AS estimate FROM mytable TABLESAMPLE SYSTEM (1);
Like @a_horse commented, the newly added clause for the SELECT command might be useful if statistics in pg_class are not current enough for some rea...
How to change Android version and code version number?
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+500
Go in the build.gradle and set the version code and name inside the defaultConfig element
defaultConfig {
minSdkVersion 9
t...
Strange out of memory issue while loading an image to a Bitmap object
... BitmapFactory.Options object. For example, an image with resolution 2048x1536 that is decoded with an inSampleSize of 4 produces a bitmap of approximately 512x384. Loading this into memory uses 0.75MB rather than 12MB for the full image (assuming a bitmap configuration of ARGB_8888). Here’s a met...
Representing and solving a maze given an image
...imread(img_file);
img = rgb2gray(img);
maze = img > 0;
start = [985 398];
finish = [26 399];
%% Init BFS
n = numel(maze);
Q = zeros(n, 2);
M = zeros([size(maze) 2]);
front = 0;
back = 1;
function push(p, d)
q = p + d;
if maze(q(1), q(2)) && M(q(1), q(2), 1)...
Java SE 6 vs. JRE 1.6 vs. JDK 1.6 - What do these mean?
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56
When you type "java -version", you see three version numbers - the java version (on mine, that'...
What is the best data type to use for money in C#?
... calculations.
You can use a decimal as follows:
decimal myMoney = 300.5m;
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Apply style to only first level of td tags
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edited Mar 5 '09 at 2:04
Shog9
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Disable same origin policy in Chrome
...gle.com" embedded in a page served from "localhost" (tested under chromium 5 / ubuntu). For me the exact command was:
Note : Kill all chrome instances before running command
chromium-browser --disable-web-security --user-data-dir="[some directory here]"
The browser will warn you that "you are ...
Disable migrations when running unit tests in Django 1.7
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+50
Look at this workaround, posted by Bernie Sumption to the Django developers mailing list:
If makemigrations has not yet been run,...
setting an environment variable in virtualenv
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runfalk
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answered Mar 6 '12 at 5:53
Kenneth ReitzKenneth R...