IF statement syntax in SQL script view

I need to include a "IF" condition in the "SELECT" section of my SQL script view.

I tried the following syntax's but I get the error 'Incorrect SQL syntax near 'IF'

1.  IF(Revenue <> '0' AND Quantity <> '0', Revenue/Quantity, '0') AS Gross Price

2.  IF(Revenue != '0' AND Quantity != '0', Revenue/Quantity, '0') AS Gross Price

3.  IF(Revenue <> '0' AND Quantity <> '0' THEN Revenue/Quantity ELSE  '0' END) AS Gross Price

4.  IF(Revenue != '0' AND Quantity != '0' THEN Revenue/Quantity ELSE  '0' END) AS Gross Price

My final SQL would read like follows:

SELECT field1, field2, IF(......) AS field3

FROM table1

Can anybody please help with the correct IF statement syntax to be used in the SQL script based view?