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How do I limit the number of rows returned by an Oracle query after ordering?
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Starting from Oracle 12c R1 (12.1), there is a row limiting clause. It does not use familiar LIMIT syntax, but it can do the job better with more options. You can find the full syntax here. (Also read more on how this works internally in Oracle in this answer).
To answer the original question, h...
How to schedule a function to run every hour on Flask?
...=print_date_time, trigger="interval", seconds=3)
scheduler.start()
# Shut down the scheduler when exiting the app
atexit.register(lambda: scheduler.shutdown())
Note that two of these schedulers will be launched when Flask is in debug mode. For more information, check out this question.
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C# generic type constraint for everything nullable
...n;
if (type.IsClass)
return;
throw new InvalidOperationException("Type is not nullable or reference type.");
}
public bool IsNull()
{
return item == null;
}
}
Then the following code compiles, but the last one (foo3) throws an exception in the...
Is there auto type inferring in Java?
...eclaration in two ways.
First, the redundant type serves as valuable documentation - readers do not
have to search for the declaration of getMap() to find out what type it
returns. Second, the redundancy allows the programmer to declare the intended
type, and thereby benefi...
How to disable HTML links
... disadvantages).
CSS way
This should be the right way (but see later) to do it when most of browsers will support it:
a.disabled {
pointer-events: none;
}
It's what, for example, Bootstrap 3.x does. Currently (2016) it's well supported only by Chrome, FireFox and Opera (19+). Internet Explo...
How to debug a bash script? [closed]
...lue is printed before the command and its expanded arguments.
That much does not seem to indicate different behaviour at all. I don't see any other relevant references to '-x' in the manual. It does not describe differences in the startup sequence.
Clarification: On systems such as a typical L...
echo that outputs to stderr
...standard Bash tool that acts like echo but outputs to stderr rather than stdout?
15 Answers
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How do you compare two version Strings in Java?
...g version numbers? I can't just use a straight String compareTo because I don't know yet what the maximum number of point releases there will be. I need to compare the versions and have the following hold true:
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Is there a way to @Autowire a bean that requires constructor arguments?
...ire requires arguments to its constructor. I've looked through the Spring docs, but cannot seem to find any reference to how to annotate constructor arguments.
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Call apply-like function on each row of dataframe with multiple arguments from each row
...estFunc(x[1],x[2]))
EDIT To access columns by name and not index you can do something like this:
testFunc <- function(a, b) a + b
apply(dat[,c('x','z')], 1, function(y) testFunc(y['z'],y['x']))
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