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CREATE TABLE `a` ( `t` varchar(1) NOT NULL, `x` int(1) NOT NULL, PRIMARY KEY (`t`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4; INSERT INTO `a` VALUES ('A',1); INSERT INTO `a` VALUES ('B',2); INSERT INTO `a` VALUES ('C',3); CREATE TABLE `b` ( `t` varchar(1) NOT NULL, `y` int(1) NOT NULL, PRIMARY KEY (`t`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4; INSERT INTO `b` VALUES ('B',2); INSERT INTO `b` VALUES ('C',3); INSERT INTO `b` VALUES ('D',4);
Select * FROM (SELECT a.t, a.x, b.y FROM a LEFT JOIN b ON a.t = b.t UNION ALL SELECT b.t, a.x, b.y FROM a RIGHT JOIN b ON a.t = b.t WHERE a.t IS NULL) A ORDER BY t ASC;
t
x
y
A
1
null
B
2
2
C
3
3
D
null
4