select * from t1;
select * from (select * from t2) a;
select a.*, b.*, c.alias + 10 from t1 a, (select c1 from t2) b, (select c3 as alias from t3) c;
select t1.c1 from t1 join (select t2.c1 from t2 join (select * from t3) a) b;