In MariaDB, LN() is a built-in function that returns the natural logarithm of its argument. In other words, it returns the base-e logarithm of its argument.
The number e, also known as Euler’s number, is a mathematical constant approximately equal to 2.71828.
LN() is the inverse of EXP(), and it’s the same as using LOG() with the single argument syntax.
In MariaDB, EXP() is a built-in function that returns the value of e (the base of natural logarithms) raised to the power of the argument.
The number e, also known as Euler’s number, is a mathematical constant approximately equal to 2.71828.
The inverse of EXP() is the LN() function or LOG() function (when using the single argument syntax).
MongoDB has a Date BSON type that allows you to store dates as dates.
You can also store dates as strings, if that’s what you need.
Taking it a step further, you can also convert a Date to a string.
This article presents three ways to convert a Date to a string in MongoDB.
In MariaDB, FLOOR() is a built-in numeric function that returns the largest integer value not greater than its argument.
In MariaDB, CEILING() is a built-in numeric function that returns the smallest integer value not less than its argument.
In MariaDB, ATAN2() is a built-in numeric function that returns the arctangent (inverse tangent) of its two arguments.
In MariaDB, ATAN() is a built-in numeric function that returns the arctangent (inverse tangent) of its argument.
In other words, it returns the value whose tangent is the argument.