In MariaDB, COMPRESS() is a built-in function that compresses a string and returns the result as a binary string.
The COMPRESS() function requires MariaDB to have been compiled with a compression library such as zlib. If MariaDB hasn’t been compiled with such a compression library, COMPRESS() returns null.
In MariaDB, UNCOMPRESS() is a built-in function that uncompresses a string that’s been compressed by the COMPRESS() function.
In MariaDB, STRCMP() is a built-in string function that compares two strings. It returns 0, -1, or 1, depending on whether the strings are the same or not.
In MariaDB, SPACE() is a built-in string function that returns a given number of space characters.
You provide the number of spaces to return when you call the function.
In MariaDB, you can use SOUNDS LIKE in a query to match words that sound alike.
In MariaDB, SOUNDEX() is a built-in string function that returns the Soundex string from a given string.
Soundex is a phonetic algorithm for indexing names by sound, as pronounced in English. If two words sound the same, they should have the same Soundex string. If two words sound similar, but not exactly the same, their Soundex string might look similar but not exactly the same.
The function accepts one argument: the string for which to return the Soundex string from.
In MariaDB, REVERSE() is a built-in string function that returns a string with the characters in reverse order.
The function accepts one argument: the string to reverse.
In MariaDB, REPLACE() is a built-in string function that allows you to replace a part of a string with another string.
The function accepts three arguments: the string, the substring to replace, and the string to replace the substring with.
Distinct values are those values with redundant duplicates removed. In other words, distinct values are unique values.
In MongoDB there are a few ways we can return distinct values in a query. This article presents 3 ways to return distinct values in the mongo shell.
In MariaDB, POSITION() is a built-in string function that returns the position of the first occurrence of a substring within another string. It’s part of ODBC 3.0.
POSITION(substr IN str) is a synonym for LOCATE(substr,str).
POSITION() is also similar to the INSTR() function, except that POSITION() uses the IN syntax, and that the argument order is reversed between these two functions.