If you fix your syntax to
select * from table1, table2;
you will get a join where every condition is true, which is the same as the Cartesian product of the two tables.
table1 table2
------ ------
A 1
B 2
C
Result:
A 1
A 2
B 1
B 2
C 1
C 2
0
solved What would be output of SQL query if we include two table without any condition