When did Chennai Super Kings play its first match?
match date refers to Match_Date; Chennai Super Kings refers to Team_Name = 'Chennai Super Kings'; first match refers to min(Match_Date)
SELECT Match_Date FROM `Match` WHERE team_1 = ( SELECT Team_Id FROM Team WHERE Team_Name = 'Chennai Super Kings' ) OR Team_2 = ( SELECT Team_Id FROM Team WHERE Team_Name = 'Chennai Super Kings' ) ORDER BY Match_Date ASC LIMIT 1