Created a query; need to filter records to find several occurrences

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I've created a query to select records from a database. It's a seed database; I want two varieties namely, Variety A and Variety B. Now from this query, I need to filter it so that I can retrieve the records that have more than 1 occurrence on a specific field. For example: I have all of variety A and B's data, now I have another field called year; I need to filter the query so that I get all the occurrences of A and B; where they have the same year. If they both don't have the same year; I don't want that record.