In MariaDB, SUBSTRING() is a built-in string function that returns a substring from a given string.
SUBSTRING() requires at least two arguments; the string, and the position for which to extract the substring from. It also accepts an optional third argument that allows you to specify how long the substring should be.
In MariaDB, MATCH AGAINST is a special construct used to perform a full-text search on a full-text index.
In MariaDB, COERCIBILITY() is a system function that returns the collation coercibility value of its string argument.
It defines how collations will be converted in the case of collation conflict. In such conflicts, an expression with a higher coercibility is converted to the collation of an expression with a lower coercibility.
In MariaDB, MAKE_SET() is a string function that returns a set value, based on the values provided in its arguments.
A set is a string containing substrings separated by comma (,) characters.
In MariaDB, TRIM_ORACLE() is a synonym for the Oracle mode version of the TRIM() function.
TRIM_ORACLE() is available in all modes, so it saves you from having to switch to Oracle mode, which is what you’d need to do if you wanted the TRIM() function to behave like Oracle’s TRIM() function.
The difference is in how each function treats empty strings. Oracle returns null whereas MariaDB returns an empty string.
In MariaDB, LTRIM_ORACLE() is a synonym for the Oracle mode version of the LTRIM() function.
LTRIM_ORACLE() is available in all modes, so it saves you from having to switch to Oracle mode, which is what you’d need to do if you wanted the LTRIM() function to behave like Oracle’s LTRIM() function.
The difference is in how each function treats empty strings. Oracle returns null whereas MariaDB returns an empty string.
In MariaDB, RTRIM_ORACLE() is a synonym for the Oracle mode version of the RTRIM() function.
RTRIM_ORACLE() is available in all modes, so it saves you from having to switch to Oracle mode, which is what you’d need to do if you wanted the RTRIM() function to behave like Oracle’s RTRIM() function.
The difference is in how each function treats empty strings. Oracle returns null whereas MariaDB returns an empty string.
In MariaDB, EXTRACTVALUE() is a built-in string function that returns CDATA from an XML fragment.
The way it works is that it accepts two string arguments: a fragment of XML markup and an XPath expression (i.e. a locator). EXTRACTVALUE() then returns the CDATA (i.e. the text) of the first text node which is a child of the element or elements matching the XPath expression.
In MariaDB, TRIM() is a built-in string function that removes characters from the start or end of a string.
By default it removes leading and trailing spaces, but you can specify which character to remove, as well as which side/s you’d like it removed from.
In MariaDB, RTRIM() is a built-in string function that returns a string with any trailing space characters removed.