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SQL Joins Vs SQL Subqueries (Performance)?
...frastructure. We have a kind of query optimization engine underneath which converts the IN (...) clauses to join (if it was possible). But when you have a Group by on a well indexed column (based on its cardinality) then it will be much faster. So it really depends on the situation.
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Password masking console application
...ass = string.Empty;
ConsoleKey key;
do
{
var keyInfo = Console.ReadKey(intercept: true);
key = keyInfo.Key;
if (key == ConsoleKey.Backspace && pass.Length > 0)
{
Console.Write("\b \b");
pass = pass[0..^1];
}
else if (!char.IsControl(keyInfo.KeyChar...
How do I get time of a Python program's execution?
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Yes, it gives a number of seconds. You can convert to min:seconds if you want. Look at Paul McGuire's answer and its secondsToStr() function.
– steveha
Dec 19 '13 at 6:48
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How do I programmatically determine operating system in Java?
...ase(), which is locale sensitive. Where this matters is particularly when converting i's to lower/upper case, since in Turkey, I becomes lower case undotted i (ı), and i becomes upper case dotted i (İ). So "WINDOWS".toLowerCase().indexOf("win") will return -1 in Turkey. Always pass a locale when...
How can I get a web site's favicon?
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You can use Google S2 Converter.
http://www.google.com/s2/favicons?domain=google.com
Source: http://www.labnol.org/internet/get-favicon-image-of-websites-with-google/4404/
...
Playing .mp3 and .wav in Java?
...wav file in my Java application? I am using Swing. I tried looking on the internet, for something like this example:
14 An...
How to split a file into equal parts, without breaking individual lines? [duplicate]
I was wondering if it was possible to split a file into equal parts ( edit: = all equal except for the last), without breaking the line? Using the split command in Unix, lines may be broken in half. Is there a way to, say, split up a file in 5 equal parts, but have it still only consist of whole li...
How do I delete NuGet packages that are not referenced by any project in my solution?
...lace. That's one of the main benefits of using package restore. As part of converting to package restore, an 'ignore' rule should be placed on the packages folder.
– Carl Bussema
May 13 '14 at 15:23
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initialize a vector to zeros C++/C++11
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You don't need initialization lists for that:
std::vector<int> vector1(length, 0);
std::vector<double> vector2(length, 0.0);
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How does #include work in C++? [duplicate]
...n C++ totally unaware of where things you're using are defined.. at what point do you stop and figure it out?
– OJFord
Aug 14 '14 at 14:59
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