greater { hop { filter_eq { all_rows ; call sign ; cjjc - fm } ; frequency } ; hop { filter_eq { all_rows ; call sign ; cfgw - fm } ; frequency } } = true
select the rows whose call sign record fuzzily matches to cjjc  fm . take the frequency record of this row . select the rows whose call sign record fuzzily matches to cfgw  fm . take the frequency record of this row . the first record is greater than the second record .