Your syntax is invalid.
SELECT * FROM table1, table2
However, the above doesn't make sense either, as you're selecting every column and row from two separate tables with no means of connecting the two tables.
Table1
ColumnA ColumnB
======= =======
Nonsense Here
Orange Noise
Table2
ColumnC ColumnD
======= =======
Horse Radish
No Sense
SELECT * FROM Table1, Table2
Result:
ColumnA ColumnB ColumnC ColumnD
======= ======= ======= =======
Nonsense Here Horse Radish
Orange Noise No Sense
Even after your edit, there's no sense in the query.
SELECT Table1.ColumnA, Table1.ColumnB, Table2.ColumnC, Table2.ColumnD
FROM Table1, Table2
still yields the same results.
You really should look for tutorials on database programming and SQL in general. Google can help.