Table: trentino_politics
Columns: municipality
inhabitants
mayor
party
election

Question: What is the Mayor of Riva del Garda in 2010?
SQL: SELECT "mayor" FROM trentino_politics WHERE "election" = 2010 AND "municipality" = 'riva del garda'

Question: How many Inhabitants were there after 2009 in the Municipality with a Party of union for trentino?
SQL: SELECT AVG("inhabitants") FROM trentino_politics WHERE "party" = 'union for trentino' AND "election" > 2009