How many players got out by being stumped in the second innings of all matches?
got out by being stumped refers to Out_Name = 'stumped'; the second innings refers to Innings_No = 2
SELECT SUM(CASE WHEN T1.Innings_No = 2 THEN 1 ELSE 0 END) FROM Wicket_Taken AS T1 INNER JOIN Out_Type AS T2 ON T2.Out_Id = T1.Kind_Out WHERE T2.Out_Name = 'stumped'