   QUOTE(str)
Quotes a string to produce a result that can be used as a properly escaped
data value in an SQL statement.  The string is returned surrounded by single
quotes and with each instance of single quote ('''), backslash ('\'),
ASCII NUL, and Control-Z preceded by a backslash.  If the argument is
NULL, the return value is the word ``NULL'' without surrounding
single quotes.
The QUOTE() function was added in MySQL 4.0.3.
