Returns the string str, right-padded with the string padstr to a length of len characters. If str is longer than len, the return value is shortened to len characters. If str, padstr, or len is NULL, the function returns NULL.
SELECT RPAD('hi',5,'?');
'hi???'
SELECT RPAD('hi',1,'?');
'h'
This function is multibyte safe.
SELECT RPAD('hi',5,'?');
'hi???'
SELECT RPAD('hi',1,'?');
'h'