show combined data of various tables [closed]

Answer 1

I think the following will produce the result you are looking for:

SELECT Usertb1.id, Usertb1.name, Usertb1.age, Usertb1.city, Usertb2.id, Usertb2.name, Usertb2.age, Usertb2.city
  FROM Usertb Usertb1 
    INNER JOIN Friendtb ON Usertb1.id = Friendtb.id
    INNER JOIN Usertb Usertb2 ON Usertb2.id = Friendtb.fid