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What's the difference between RANK() and DENSE_RANK() functions in oracle?
...secutive. No ranks are skipped if there are ranks with multiple items.
As for nulls, it depends on the ORDER BY clause. Here is a simple test script you can play with to see what happens:
with q as (
select 10 deptno, 'rrr' empname, 10000.00 sal from dual union all
select 11, 'nnn', 20000.00 from ...
Test whether string is a valid integer
...dicates the end of the input pattern
So the regex matches an optional - (for the case of negative numbers), followed by one or more decimal digits.
References:
http://www.tldp.org/LDP/abs/html/bashver3.html#REGEXMATCHREF
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What's the main difference between int.Parse() and Convert.ToInt32
...e an integer (say, if some web service is handing you an integer in string format), you'd use Int32.Parse().
If you're collecting input from a user, you'd generally use Int32.TryParse(), since it allows you more fine-grained control over the situation when the user enters invalid input.
Convert.To...
Center content of UIScrollView when smaller
I have a UIImageView inside a UIScrollView which I use for zooming and scrolling. If the image / content of the scroll view is bigger than the scroll view, everything works fine. However, when the image becomes smaller than the scroll view, it sticks to the top left corner of the scroll view. I ...
Age from birthdate in python
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That probably depends on your definition of "age". For all practical purposes a birthday is usually given as a date, not timezone-aware datetime (i.e., "born" is missing the details). Most people are not born at midnight sharp (so usually observe prematurely :-)), and when in...
Parallelize Bash script with maximum number of processes
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@EverythingRightPlace, the question explicitly asks for no more processes than available processors. --max-procs=0 is more like the questioner's attempt (start as many processes as arguments).
– Toby Speight
Feb 26 '16 at 10:30
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Android notification is not showing
...hout an icon. So, add the setSmallIcon call to the builder chain like this for it to work:
.setSmallIcon(R.drawable.icon)
Android Oreo (8.0) and above
Android 8 introduced a new requirement of setting the channelId property by using a NotificationChannel.
private NotificationManager mNotificationM...
How can I detect when an Android application is running in the emulator?
... differently when running on the emulator than when running on a device. ( For example , using 10.0.2.2 instead of a public URL to run against a development server automatically.) What is the best way to detect when an Android application is running in the emulator?
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Selenium c# Webdriver: Wait Until Element is Present
I want to make sure that an element is present before the webdriver starts doing stuff.
24 Answers
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Does Java have a complete enum for HTTP response codes?
...m type in some standard Java class library that defines symbolic constants for all of the valid HTTP response codes. It should support conversion to/from the corresponding integer values.
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