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CREATE TABLE office_layout ( floor INT, office INT ); INSERT INTO office_layout (floor, office) VALUES (1, 4), (2, 4), (3, 3), (4, 3), (1, 5), (2, 5), (3, 4), (4, 4), (1, 6), (2, 6), (3, 5), (4, 5), (2, 7), (3, 6), (4, 6), (3, 7), (4, 7);
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<?php $sql = <<<SQL SELECT floor, office, ROW_NUMBER() OVER (PARTITION BY floor ORDER BY office) priority FROM office_layout ORDER BY priority, floor, office; SQL; $result = $mysqli->query($sql)->fetch_all(MYSQLI_ASSOC); var_export($result);
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