postgresql: comparison of column values ​​when there is nothing in common between the tables

I have the need to show the value stored in columns of separate tables where the tables and columns have nothing in common. I just want to compare the content of the rows in each column side by side. And only the first 10 rows would be enough for my purposes. There are no primary keys or common link between the tables.

I have many tables with hundreds of columns to compare. Is there a simple way to do this?

that is to say
Table1, column3 | Table2, column6 | Table3, column1

Resulting in something like the following

tbl1col3 | tbl2col6 | tbl3col1
123.9 | abc | x12
234.0 | bcd o23

Using postgresql 9.6, pgadmin4 v3.5