I have two tables - table1 and table2 - with the same columns in two different schema.

Table1

```
col1 | col2 | col3
-----+------+------
a1   | b1   | c1
a2   | b2   | c2

```

and table2

```
col1 | col2 | col3
-----+------+------
a1   | b1   | c1
a2   | b2   | c2

```

How to query from both tables (`schema1.table1` and `schema2.table2`) so that I get the result as:

```
  col1 | col2 | col3
  -----+------+------
   a1  | b1   | c1
   a2  | b2   | c2
   a1  | b1   | c1
   a2  | b2   | c2

```