MySQL:Apakah mungkin untuk BERGABUNG dengan hasil GROUP-BY ke dua SELECT?

Ini berfungsi

select * from (
    (select 1 a,2 b,3 c) t1 left join (select null a,2 b,5 c) t2 on (t1.b=t2.b)
);

Atau,

select * from (
    (select 1 a,2 b,3 c) t1 left join (select null a,2 b,5 c) t2 using (b)
);

Keduanya menghasilkan

+---+---+---+------+---+---+
| a | b | c | a    | b | c |
+---+---+---+------+---+---+
| 1 | 2 | 3 | NULL | 2 | 5 |
+---+---+---+------+---+---+
1 row in set (0.00 sec)