Update README.md

Author: alexoliveros92

README.md

@@ -1 +1,8 @@
 # database
+MATCH (f:Flight)-[:OPERATED_BY]->(a:Airlines)
+WITH a.id AS airline_code, a.airline AS airline,
+     COUNT(CASE WHEN f.delay_id <> 'N' THEN 1 END) AS delayed,
+     COUNT(*) AS total_flights
+RETURN airline_code, airline, delayed, total_flights, (toFloat(delayed) / total_flights) * 100 AS `Delay percentage (%)`
+ORDER BY (`Delay percentage (%)`) desc
+LIMIT 5