Top Buyer and Seller: SQL Approach

Easy statistics interview practice: Top Buyer and Seller: SQL Approach.

You need to find the trader who bought and sold the most META stock in the past 30 days, allowing for ties. Given a `transactions_table` with columns: `transaction_date`, `stock_symbol`, `buyer_id`, `seller_id`, `transaction_id`, `purchase_price`. Which SQL approach correctly solves this?

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