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What's wrong with nullable columns in composite primary keys?
...ons the designer likely did not intend, which is why many systems throw an error when you try this.
Consider the case of module/package versions stored as a series of fields:
CREATE TABLE module
(name varchar(20) PRIMARY KEY,
description text DEFAULT '' NOT NULL);
CREATE TABLE version...
How to create a file in a directory in java?
...n't forget to check the called method (mkdirs and createNewFile) calls for errors
– Alessandro S.
Jul 28 '15 at 12:26
1
...
Set cache-control for entire S3 bucket automatically (using bucket policies?)
...y are case sensitive and must be entered accurately
or you'll keep getting errors about invalid signatures or similar.
Remember to add s3:ListAllMyBuckets permissions to the keys or you will get an AccessDenied error while testing access.)
./s3cmd --recursive modify --add-header="Cache-Control:publi...
Sorting 1 million 8-decimal-digit numbers with 1 MB of RAM
...for line in sorter.stdout]
print('OK!' if result == sorted(sequence) else 'Error!')
A detailed explanation of the algorithm can be found in the following series of posts:
1MB Sorting Explained
Arithmetic Coding and the 1MB Sorting Problem
Arithmetic Encoding Using Fixed-Point Math
...
What is the maximum length of a URL in different browsers?
...) Chrome/43.0.2357.130 Safari/537.36
2046
It then blew up with:
HTTP Error 404.15 - Not Found The request filtering module is
configured to deny a request where the query string is too long.
Same on Internet Explorer 8 and Firefox
Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; WOW64...
git:// protocol blocked by company, how can I get around that?
...ut when I use this solution, it still fails, but with a slightly different error. It says "error: while accessing https://... fatal: HTTP request failed" Does anyone have any insight on this? Is my Host blocking something? My other submodules update fine, I am only having trouble with one.
...
“To Do” list before publishing Android app to market [closed]
...e to the user that something wrong happened. In the meantime, retrieve the error with Crashlytics or something similar.
Don't use too much .jar libraries, prefer library projects (optimize the code size) and add them using gradle.
Prefer using vector images since it will reduce APK size and fit corr...
Getting file size in Python? [duplicate]
...h.getsize(path) which will
Return the size, in bytes, of path. Raise OSError if the file does not exist or is inaccessible.
import os
os.path.getsize('C:\\Python27\\Lib\\genericpath.py')
Or use os.stat(path).st_size
import os
os.stat('C:\\Python27\\Lib\\genericpath.py').st_size
Or use Pa...
How do I disable fail_on_empty_beans in Jackson?
Using jackson 2.1, how do I disable the fail_on_empty beans that the error message seems to want me to disable?
12 Answe...
关于php的socket初探 - PHP - 清泛IT论坛，有思想、有深度
...(__CLASS__, 'ev_read'), array(__CLASS__, 'ev_write'), array(__CLASS__, 'ev_error'), $id);
event_buffer_base_set($buffer, $base);
event_buffer_timeout_set($buffer, 30, 30);
event_buffer_watermark_set($buffer, EV_READ, 0, 0xffffff);
event_buffer_priority_set($buffer, 10);
event_buffer_enable...