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What is the Difference Between read() and recv() , and Between send() and write()?
... on a socket, and will produce an error if you try to use it on, say, STDIN_FILENO.
– Joey Adams
Jul 31 '11 at 5:29
78
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Storing sex (gender) in database
... this; no need to invent your own scheme:
http://en.wikipedia.org/wiki/ISO_5218
Per the standard, the column should be called "Sex" and the 'closest' data type would be tinyint with a CHECK constraint or lookup table as appropriate.
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What is the convention for word separator in Java package names?
...ample, com.example.deepspace, not com.example.deepSpace or com.example.deep_space.
— Google Java Style Guide: 5.2 Rules by identifier type: 5.2.1 Package names.
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How to sort an array of integers correctly
... answered Nov 17 '18 at 21:01
dy_dy_
4,12744 gold badges2020 silver badges2828 bronze badges
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How to print number with commas as thousands separators?
... For Python ≥3.6
Locale aware
import locale
locale.setlocale(locale.LC_ALL, '') # Use '' for auto, or force e.g. to 'en_US.UTF-8'
'{:n}'.format(value) # For Python ≥2.7
f'{value:n}' # For Python ≥3.6
Reference
Per Format Specification Mini-Language,
The ',' option signals the use...
Finding duplicate values in a SQL table
...aggregated columns in the GROUP BY.
MySQL is unpredictable and you need sql_mode=only_full_group_by:
GROUP BY lname ORDER BY showing wrong results;
Which is the least expensive aggregate function in the absence of ANY() (see comments in accepted answer).
Oracle isn't mainstream enough (warning: h...
Set default CRAN mirror permanent in R
...?Startup:
The
path of this file is taken from the value of the R_PROFILE
environment variable (after tilde expansion). If this variable is
unset, the default is R_HOME/etc/Rprofile.site, which is used if
it exists (which it does not in a 'factory-fresh' installation)...
Can table columns with a Foreign Key be NULL?
...NGINE=INNODB;
CREATE TABLE child (id INT NULL,
parent_id INT NULL,
FOREIGN KEY (parent_id) REFERENCES parent(id)
) ENGINE=INNODB;
INSERT INTO child (id, parent_id) VALUES (1, NULL);
-- Query OK, 1 row affected (0.01 sec)
INSERT INTO child (id, parent_id)...
Secret copy to clipboard JavaScript function in Chrome and Firefox?
...learConsoleMessages();
}
> copy
function (object)
{
if (injectedScript._type(object) === "node")
object = object.outerHTML;
InjectedScriptHost.copyText(object);
}
While the Firebug source also defines a list of functions:
this.clear = function() // no web page interaction
{
Firebug.Cons...
JavaScript equivalent to printf/String.Format
...
@Raphael_ and @rescdsk: .. also works: 33333..toExponential(2);
– Peter Jaric
May 7 '13 at 8:12
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