[android-developers] SQL and preference

Hi all. Help me find the right path.
I have a database in it one table, the table has a column of city and
address when opening the database shows all of the city.
I want to create a preference, where you can select a city and display
a list of addresses only the selected city.
I have to write 3 different SQL query? And depending on the setting of
output result, to cause a particular query in the database. Right?

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