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How to request a random row in SQL?
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See this post: SQL to Select a random row from a database table. It goes through methods for doing this in MySQL, PostgreSQL, Microsoft SQL Server, IBM DB2 and Oracle (the following is copied from that link):
Select a random row with MySQL:
SELECT column FROM table
ORDER BY RAND()
LIMIT ...
Can I convert a C# string value to an escaped string literal
In C#, can I convert a string value to a string literal, the way I would see it in code? I would like to replace tabs, newlines, etc. with their escape sequences.
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How can I disable a button in a jQuery dialog from a function?
..." button to only be enabled once all the fields have content in them, else it will remain disabled.
33 Answers
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what does -webkit-transform: translate3d(0,0,0); exactly do? Apply to body?
what does -webkit-transform: translate3d(0,0,0); exactly do?
Does it have any performance issues? Should I just apply it to the body or individual elements? It seems to improve scroll events drastically.
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Socket File “/var/pgsql_socket/.s.PGSQL.5432” Missing In Mountain Lion (OS X Server)
... Server to Mountain Lion using OS X Server. I am having the same problem with PostgreSQL that I did last year when I first installed Lion Server.
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html select only one checkbox in a group
... // the name of the box is retrieved using the .attr() method
// as it is assumed and expected to be immutable
var group = "input:checkbox[name='" + $box.attr("name") + "']";
// the checked state of the group/box on the other hand will change
// and the current value is retriev...
Callback functions in C++
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Note: Most of the answers cover function pointers which is one possibility to achieve "callback" logic in C++, but as of today not the most favourable one I think.
What are callbacks(?) and why to use them(!)
A callback is a callable (see further down) accepted by a class or function, used to ...
How do I get IntelliJ IDEA to display directories?
I've been trying out IntelliJ IDEA for JavaScript editing, and I like it so far, but I'm having a small problem with a new project.
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Why does int num = Integer.getInteger(“123”) throw NullPointerException?
...ssues at play here:
Integer getInteger(String) doesn't do what you think it does
It returns null in this case
the assignment from Integer to int causes auto-unboxing
Since the Integer is null, NullPointerException is thrown
To parse (String) "123" to (int) 123, you can use e.g. int Integer...
Non-type template parameters
...er should be a constant integral expression. Can someone shed light why is it so ?
4 Answers
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