Table: ecellenza_match_results
Columns: team_1
agg
team_2
1st_leg
2nd_leg

Question: What is the mean team 1 when the 1st leg is Albignasego (Veneto A)?
SQL: SELECT AVG("team_1") FROM ecellenza_match_results WHERE "1st_leg" = 'albignasego (veneto a)'