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Return 0 if field is null in MySQL
... a week to bill all customers. Data is written all week, then at a certain time, its computed and billed. Think of it like a subscription service. You can make changes during the tenure of the billing period, and your activity is charged at appropriate intervals.
– Kevin
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Proper usage of Java -D command-line parameters
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Feel kinda stupid on how much time I spent on that one! Thanks for pointing that out. :)
– toidiu
Aug 13 '16 at 22:00
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Difference between exit(0) and exit(1) in Python
...pretty common. A non-zero exit code is treated as an abnormal exit, and at times, the error code indicates what the problem was. A zero error code means a successful exit.
This is useful for other programs, shell, caller etc. to know what happened with your program and proceed accordingly.
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What is the use of a private static variable in Java?
...ociated with the type itself instead of any instances of the type.
So any time you want some state which is associated with the type rather than any particular instance, and you want to keep that state private (perhaps allowing controlled access via properties, for example) it makes sense to have a...
What is the difference between #include and #include “filename”?
In the C and C++ programming languages, what is the difference between using angle brackets and using quotes in an include statement, as follows?
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What is the difference between Fragment and FragmentActivity?
My question is apart from the obvious inheritance differences, what are the main differences between Fragment and FragmentActivity ? To what scenarios are each class best suited? I'm trying to get an understanding of why both of these classes exist...
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curl -GET and -X GET
...u have the option. Fail early, fail fast, reduces accidents, reduces debug time. The only time you have an excuse for skipping it is when typing it into the command line. Any script should specify -XGET even when strictly unnecessary.
– Backgammon
Feb 25 '19 at...
How to do a git diff on moved/renamed file?
I moved a file using git mv . Now I would like to do a diff on the new file to compare it with the old file (with the old, now non-existent name).
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How do you split a list into evenly sized chunks?
...urn zip_longest(*[iter(iterable)]*n, fillvalue=padvalue)
I guess Guido's time machine works—worked—will work—will have worked—was working again.
These solutions work because [iter(iterable)]*n (or the equivalent in the earlier version) creates one iterator, repeated n times in the list. i...
What is JavaScript garbage collection?
...e objects they create and use, though of course there's no avoiding it sometimes - it is always beneficial to have at least a rough idea of how garbage collection works.
Historical note: an earlier revision of the answer had an incorrect reference to the delete operator. In JavaScript the delete op...