In idle conversation I was asked by MM.
Question: What is the maximum number of colons ‘:’ that may appear in a valid URL?
If you said zero to one, then you are victim of browsers, and you have never used anything but a browser.
If you said one, then your a novice.
If you said two, then you have probably seen http://host:port at some time.
If you said three, then you would be correct, the elite.
http://user:pass@host:port/location
For the record my initial answer was 2.
MySQL’s built-in AVG() computes the arithmetic mean — the sum divided by the count. That is the right default for many questions, but it is not always the right measure of central tendency.
MySQL offers three different approaches to extending the SQL capabilities with the default product you download and install. These are: User Defined Function (UDF) MySQL Manual MySQL Plugin MySQL Manual MySQL Component MySQL Manual For the purposes of this post I will be using the current LTS version MySQL 8.
The one-sample Z-test determines whether a sample mean differs significantly from a known population mean when the population standard deviation is also known. It is the appropriate test when the population parameters are established — quality control benchmarks, national averages, long-run process measurements — and you want to evaluate whether a new sample is consistent with them.
