Values in different columns on the same row are treated as AND conditions. Values in different rows are treated as OR conditions. Look at the following Query Conditions Grid example.
This yields the following SELECT statement:
SELECT E1.e_no, E1.lname, E1.payrate, E1.st, E1.com FROM TUTORIAL.TUTORIAL.EMPLOYEE E1 WHERE ((E1.e_no Between 2 and 8) OR (E1.lname like ""hur%"") OR ((E1.payrate >4 AND E1.payrate < 15) AND (E1.com is null)) OR (E1.st <> "MD"))