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When to use “ON UPDATE CASCADE”
...regularly but I never use "ON UPDATE CASCADE" as I am not so sure in what situation it will be useful.
7 Answers
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Is there ever a time where using a database 1:1 relationship makes sense?
I was thinking the other day on normalization, and it occurred to me, I cannot think of a time where there should be a 1:1 relationship in a database.
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JavaScript “new Array(n)” and “Array.prototype.map” weirdness
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It appears that the first example
x = new Array(3);
Creates an array with undefined pointers.
And the second creates an array with pointers to 3 undefined objects, in this case the pointers them self are NOT undefined, on...
Checking network connection
...the IP addresses for google.com. Change http://216.58.192.142 to whatever site can be expected to respond quickly.
This fixed IP will not map to google.com forever. So this code is
not robust -- it will need constant maintenance to keep it working.
The reason why the code above uses a fixed IP a...
jquery variable syntax [duplicate]
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$self has little to do with $, which is an alias for jQuery in this case. Some people prefer to put a dollar sign together with the variable to make a distinction between regular vars and jQuery objects.
example:
var self = 'some stri...
Ruby ampersand colon shortcut [duplicate]
... is wrong, so to speak. What's happening here isn't "ampersand and colon", it's "ampersand and object". The colon in this case is for the symbol. So, there's & and there's :foo.
The & calls to_proc on the object, and passes it as a block to the method. In Rails, to_proc is implemented on Sym...
How do I set a JLabel's background color?
...ckground of a JLabel to a different color. I can see the word "Test" and it's blue, but the background doesn't change at all. How can I get it to show?
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How to override a JavaScript function
...follow
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edited Mar 23 '11 at 18:29
answered Mar 23 '11 at 17:50
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How to sort the files according to the time stamp in unix? [closed]
... Actually, many *nix filesystems do support creation timestamp… it's just not cross-platform. On FreeBSD and OS X, it's generally only available on native BSD filesystems (including HFS+ on OS X); it's called "file creation time", and ls -U sorts by it. On Linux, it's available on most fi...
Difference between exit() and sys.exit() in Python
In Python, there are two similarly-named functions, exit() and sys.exit() . What's the difference and when should I use one over the other?
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