问如何创建包含空值的两个表的联合？

EN

CREATE TABLE ucharacters (
  ucharacter VARCHAR(50),
  episode INT(2),
  line INT(6)
  );

CREATE TABLE uplaces (
  ucharacter VARCHAR(50),
  episode INT(2),
  line INT(6),
  place VARCHAR(40)
  );

INSERT INTO ucharacters VALUES ('Molly', 4, 123);
INSERT INTO ucharacters VALUES ('Leo', 5, 567);
INSERT INTO uplaces VALUES ('Leo', 5, NULL, 'Athens');

UCHARACTER  EPISODE LINE PLACE
Molly       4       123  NULL
Leo         5       567  NULL
Leo         7       NULL Athens

SELECT tabkey.ucharacter, 

ucharacters.episode, ucharacters.line, 

uplaces.episode, uplaces.line, uplaces.place

FROM 

(SELECT ucharacters.ucharacter FROM ucharacters
 UNION ALL
 SELECT uplaces.ucharacter FROM uplaces) as tabkey

LEFT JOIN

ucharacters on tabkey.ucharacter = ucharacters.ucharacter

LEFT JOIN

uplaces on tabkey.ucharacter = uplaces.ucharacter;