For each row in a database1 , compare the data in the cell at index 1 to each row in an existing database2 at cell index 1, and if there is a match, then change the value of the cell at index2 of database2 from 1 to 0
2 NSDictionaries?
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For each row in a database1 , compare the data in the cell at index 1 to each row in an existing database2 at cell index 1, and if there is a match, then change the value of the cell at index2 of database2 from 1 to 0
2 NSDictionaries?
If the data is generated and consumed in app then CoreData.
Otherwise sqlite.