Flynet:
Output columnnames have to be unique, in aggragations thus:
SELECT (~field1~*field2) as alias, (field1*~field2~) as alias2 FROM …. OR
SELECT (field1*field2) as ~alias~, (field1*field2) as ~alias2~ FROM ….
AND NOT LIKE
SELECT (~field1~*field2) as alias, (~field1~*field2) as alias2 FROM ….