Syntax:
TRIM([{BOTH | LEADING | TRAILING} [remstr] FROM] str), TRIM([remstr
FROM] str)

Returns the string str with all remstr prefixes or suffixes removed. If
none of the specifiers BOTH, LEADING, or TRAILING is given, BOTH is
assumed. remstr is optional and, if not specified, spaces are removed.

URL: https://mariadb.com/kb/en/trim/

