Android: Insert only new records from Server(Google sheet) to Client (SQLiteDatabase)

Currently , In Android - i am able to get complete data from Google Sheet and insert into Sqlite Database using Content Providers (bulk Insert) . (fetching Data via AsyncTask)

Problem is: I want to only insert new records which are available in Google Sheet and not in Sqlite Database. Unique combination in Database and excel sheet is Date + City

Can someone guide me on how to achieve this? Please

Any existing example is highly appreciable. As i am bit new to Android Development.