Getting same geography code for different city under same state and county

Summary:

Getting same geography code for different city under same state and county, i am expecting unique city code for all cities under same county and state. i am using below query, please let me know if my understanding is correct or any issue with the code?

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SELECT st_name.identifier_value CITY,

state_ident.identifier_value CODE

          FROM hz_geographies state_geo

               ,hz_geography_identifiers state_ident

               ,hz_geography_identifiers st_name 

           WHERE state_geo.geography_type = 'CITY'