query: SELECT CName FROM COURSE WHERE Credits  =  3 UNION SELECT CName FROM COURSE WHERE Credits  =  1 AND Hours  =  4
question: Do Find name course what has either 3 credit or 1 a credit but 4 hour.
query_toks: SELECT CName FROM COURSE WHERE Credits = 3 UNION SELECT CName FROM COURSE WHERE Credits = 1 AND Hours = 4
query_toks_no_value: select cname from course where credits = value union select cname from course where credits = value and hours = value
question_toks: Do Find name course what has either 3 credit or 1 a credit but 4 hour.