Of the matches that were won by runs by team 1, what percentage have team 1 won the toss and decided to field?
won by runs refers to Win_Type = 'runs'; won the toss and decided to field refers to Toss_Winner and Toss_Name = 'field'; percentage = divide(count(Team_1) when Match_Winner = Team_1 and Toss_Winner = Team_1, count(Team_1)) as percentage
SELECT CAST(COUNT(CASE WHEN T1.Team_1 = T1.Match_Winner = T1.Toss_Winner THEN 1 ELSE 0 END) AS REAL) * 100 / TOTAL(T1.Team_1) FROM `Match` AS T1 INNER JOIN Win_By AS T2 ON T1.Win_Type = T2.Win_Id INNER JOIN Toss_Decision AS T3 ON T1.Toss_Decide = T3.Toss_Id WHERE T3.Toss_Name = 'field' AND T2.Win_Type = 'runs'