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SELECT COUNT(DISTINCT SUBSTRING(seat_no, 1, LENGTH(seat_no) - 1)) AS rows_count, COUNT(*) AS seats_count FROM seats WHERE aircraft_code = '773'; ; select * from query_cost('SELECT COUNT(DISTINCT SUBSTRING(seat_no, 1, LENGTH(seat_no) - 1)) AS rows_count, COUNT(*) AS seats_count FROM seats WHERE aircraft_code = ''773'';');

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