eq { count { filter_greater { filter_less { all_rows ; land area ( km square ) ; 10.0 } ; population density ( per km square ) ; 150.0 } } ; 2 } = true
select the rows whose land area  km square  record is less than 10.0 . among these rows , select the rows whose population density  per km square  record is greater than 150.0 . the number of such rows is 2 .