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Select random row from a sqlite table
... .timer on
sqlite> select count(*) from payment;
16049
Run Time: real 0.000 user 0.000140 sys 0.000117
sqlite> select payment_id from payment limit 1 offset abs(random()) % (select count(*) from payment);
14746
Run Time: real 0.002 user 0.000899 sys 0.000132
sqlite> select payment_id from ...
How to make unicode string with python3
...
This how I solved my problem to convert chars like \uFE0F, \u000A, etc. And also emojis that encoded with 16 bytes.
example = 'raw vegan chocolate cocoa pie w chocolate & vanilla cream\\uD83D\\uDE0D\\uD83D\\uDE0D\\u2764\\uFE0F Present Moment Caf\\u00E8 in St.Augustine\\u27...
Convert form data to JavaScript object with jQuery
...onger cater to individual users with IE8, but when an organization with 10,000 employees that all use IE8 comes along...that's different. Fortunately, Microsoft is working hard on that problem.
– Ethan Brown
printf with std::string?
...e hello world program, printf would be able to compile it in less than 60, 000 bits as opposed to cout, it would take over 1 million bits to compile.
For your situation, id suggest using cout simply because it is much more convenient to use. Although, I would argue that printf is something good ...
Errors: “INSERT EXEC statement cannot be nested.” and “Cannot use the ROLLBACK statement within an I
...portant when it's called several times a second throughout the day and 100,000 times in a nightly process.
– Jason Goemaat
Aug 4 '14 at 21:06
...
CSS hexadecimal RGBA?
...and ff represent a fully opaque color.
Example 3In other words, #0000ffcc represents the same color as rgba(0, 0, 100%, 80%) (a slightly-transparent blue).
4 digits
This is a shorter variant of the 8-digit notation, "expanded" in the same way as the 3-digit notation is. The fi...
Accessing items in an collections.OrderedDict by index
...Dict is only a tiny bit faster than items()[0]. With an OrderedDict of 10,000 entries, next(iter(d.items())) was about 200 times faster than items()[0].
BUT if you save the items() list once and then use the list a lot, that could be faster. Or if you repeatedly { create an items() iterator and ...
Advantages of Antlr (versus say, lex/yacc/bison) [closed]
... limitations.
ANTLR generated parsers are typically in the vicinity of 10.000 lines of code and more. Handwritten recursive descent parsers are often in the same ballpark. Wirth's Oberon compiler is perhaps the most compact one with about 4000 lines of code including code generation, but Oberon is ...
How to change checkbox's border style in CSS?
...: 0 0 2px #ccc;
}
label:hover span,
label:hover span
{
color: #000;
}
input[type="radio"] + span::before,
input[type="checkbox"] + span::before
{
content: "";
width: 12px;
height: 12px;
margin: 0 4px 0 0;
border: solid 1px #a8a8a8;
line-height: 14px;
...
Why is Magento so slow? [closed]
...x5650 Xeon + 16 GB RAM server and having a Rproxy on top can take up to 50 000 unique visitors a day with smooth pages to everybody.
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