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MySQL/SQL: Group by date only on a Datetime column
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Cast the datetime to a date, then GROUP BY using this syntax:
SELECT SUM(foo), DATE(mydate) FROM a_table GROUP BY DATE(a_table.mydate);
Or you can GROUP BY the alias as @orlandu63 suggested:
SELECT SUM(foo), DATE(mydate) DateOnly FROM a_table GROUP BY DateOnly;
Though I don't think it'll make...
How to get label of select option with jQuery?
...layed text for both styles of <option> elements:
<option label="foo"><option> -> "foo"
<option>bar<option> -> "bar"
If it has both a label attribute and text inside the element, it'll use the label attribute, which is the same behavior as the browser.
For pos...
Not class selector in jQuery
... It is quicker now that the vast majority of browsers support querySelectorAll, but that hasn't always been the case.
– lonesomeday
Jul 23 '13 at 8:18
4
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Why does one hot encoding improve machine learning performance?
...e. The three possible values of w×x are 0, w and 2×w. Either these three all lead to the same decision (they're all < b or ≥b) or "UK" and "French" lead to the same decision, or "French" and "US" give the same decision. There's no possibility for the model to learn that "UK" and "US" should b...
How to make connection to Postgres via Node.js
I find myself trying to create a postgres database, so I installed postgres and started a server with initdb /usr/local/pgsql/data , then I started that instance with postgres -D /usr/local/pgsql/data now how can I interact with this through node? For example, what would the connectionstring be...
Using Case/Switch and GetType to determine the object [duplicate]
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If I really had to switch on type of object, I'd use .ToString(). However, I would avoid it at all costs: IDictionary<Type, int> will do much better, visitor might be an overkill but otherwise it is still a perfectly fine solu...
How to write a Ruby switch statement (case…when) with regex and backreferences?
...egex matching groups are always stored in pseudo variables $1 to $9:
case foo
when /^([0-9][0-9])/
print "the month is #{$1}"
else
print "something else"
end
You can also use the $LAST_MATCH_INFO pseudo variable to get at the whole MatchData object. This can be useful when using named cap...
Importing CSV with line breaks in Excel 2007
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@user1859022 I double that for Hungarian locale. actually any locale that uses comma as decimal separator has to use semicolon as field separator for the double-click csv open to work properly
– robotik
Jul 28 '16 at 11:53
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Is there a simple way to remove multiple spaces in a string?
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That's true, string.split also handles all kinds of whitespaces.
– Josh Lee
Oct 10 '09 at 7:55
7
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What's the easiest way to install a missing Perl module?
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On Unix:
usually you start cpan in your shell:
# cpan
and type
install Chocolate::Belgian
or in short form:
cpan Chocolate::Belgian
On Windows:
If you're using ActivePerl on Windows, the PPM (Perl Package Manager) has much of t...