大约有 5,475 项符合查询结果（耗时：0.0246秒） [XML]
Format number to 2 decimal places
...en you should fix it. I will still get useful for everyone, and it will be 100% correct. Win-win :)
– Benoit Duffez
Dec 22 '14 at 9:21
|
sho...
Fast way to discover the row count of a table in PostgreSQL
...ists 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 reason. For ex...
How can I add new keys to a dictionary?
...oo': 'bar'}
>>> def f():
... d = {}
... for i in xrange(100):
... d['foo'] = i
...
>>> def g():
... d = {}
... for i in xrange(100):
... d.__setitem__('foo', i)
...
>>> import timeit
>>> number = 100
>>> min(timeit.repe...
How to do a SOAP Web Service call from Java class?
...CelsiusToFahrenheit>
<myNamespace:Celsius>100</myNamespace:Celsius>
</myNamespace:CelsiusToFahrenheit>
</SOAP-ENV:Body>
</SOAP-ENV:Envelope>
*/
// SOAP Body
SOAPBody ...
How do you get centered content using Twitter Bootstrap?
...y-auto. This will center the element within it's container. For example, h-100 makes the row full height, and my-auto will vertically center the col-sm-12 column.
<div class="row h-100">
<div class="col-sm-12 my-auto">
<div class="card card-block w-25">Card</div>...
Why is require_once so bad to use?
....046600103378296
require_once 1.2219581604004 3.2908599376678
10-100× slower with require_once and it's curious that require_once is seemingly slower in hhvm. Again, this is only relevant to your code if you're running *_once thousands of times.
<?php // test.php
$LIMIT = 1000000;
...
How to initialise memory with new operator in C++?
... You can allocate and default-initialize in one step, like this:
int vals[100] = {0}; // first element is a matter of style
2) use memset(). Note that if the object you are allocating is not a POD, memsetting it is a bad idea. One specific example is if you memset a class that has virtual func...
Which is fastest? SELECT SQL_CALC_FOUND_ROWS FROM `table`, or SELECT COUNT(*)
... a query with 4 joins on a 168,000 row database. Selecting just the first 100 rows with a SQL_CALC_FOUND_ROWS took over 20 seconds; using a separate COUNT(*) query took under 5 seconds (for both count + results queries).
– Sam Dufel
Jul 11 '12 at 23:59
...
How does Facebook Sharer select Images and other metadata when sharing my URL?
...t;a class="btn" target="_blank" href="http://www.facebook.com/sharer.php?s=100&amp;p[title]=<?php echo urlencode(YOUR_TITLE);?>&amp;p[summary]=<?php echo urlencode(YOUR_PAGE_DESCRIPTION) ?>&amp;p[url]=<?php echo urlencode(YOUR_PAGE_URL); ?>&amp;p[images][0]=<?php...
Why are margin/padding percentages in CSS always calculated against width?
...if you specify their width to be larger. Typical block elements are width 100% and expand automatically in the vertical direction (unknown). That's why width doesn't have the same problem.
– Lucent Fox
Oct 18 '16 at 20:00
...