Q&A for experienced flyers, pilots, and builders of drones and model aircraft
SELECT u.Id AS [User Link], CONCAT('https://stackoverflow.com/users/', u.Id) AS [Profile Link], u.DisplayName, u.Location, u.WebsiteUrl, u.AboutMe, u.Views, u.UpVotes, u.DownVotes FROM Users u JOIN ( SELECT DISTINCT UserId FROM Badges WHERE LOWER(Name) IN ('big data', 'hadoop', 'yaws', 'python') AND Class IN (2, 3) AND TagBased = 1 ) tag_badges ON tag_badges.UserId = u.Id WHERE LOWER(Location) LIKE '%london%'