I am performing a SQL query in PostgreSQL using a `CASE` statement like this:

```
SELECT
    CASE column1
        WHEN something THEN 10
        ELSE 20
        END AS newcol1
    CASE column12
        WHEN something THEN 30
        ELSE 40
        END AS newcol2
COUNT(column3) newcol3
FROM table
GROUP BY newcol1,newcol2,newcol3

```

I need a fourth column which has to be the result of `newcol2 * newcol3`, how can I do that?

If I put `(newcol2 * newcol3) AS newcol4` I get a syntax error.