string_function 

<string_function> ::=
  <string_spec> || <string_spec>
| <string_spec> & <string_spec>
| ALPHA (<string_spec>[,<unsigned_integer>])
| ASCII (<string_spec>)
| EXPAND (<string_spec>,<unsigned_integer>)
| GET_OBJECTNAME (<string_literal>)
| GET_SCHEMA (<string_literal>)
| INITCAP (<string_spec>)
| LFILL (<string_spec>,<string_literal>[,<unsigned_integer>])
| LOWER (<string_spec>)
| LPAD (<string_spec>,<expression>,<string_literal>[,<unsigned_integer>])
| LTRIM (<string_spec>[,<string_spec>])
| MAPCHAR (<string_spec>[,<unsigned_integer>][,<mapchar_set_name>])
| REPLACE (<string_spec>,<string_spec>[,<string_spec>])
| RFILL (<string_spec>,<string_literal>[,<unsigned_integer>])
| RPAD (<string_spec>,<expression>,<string_literal>[,<unsigned_integer>])
| RTRIM (<string_spec>[,<string_spec>])
| SOUNDEX (<string_spec>)
| SUBSTR (<string_spec>,<expression>[,<expression>])
| TRANSLATE (<string_spec>,<string_spec>,<string_spec>)
| TRIM (<string_spec>[,<string_spec>])
| UPPER (<string_spec>)