Table: station_traffic
Columns: station_name
2002_03
2004_05
2005_06
2006_07
2007_08
2008_09
2009_10
2010_11
2011_12

Question: Which stations had volume of 5088 in 2004-05?
SQL: SELECT "station_name" FROM station_traffic WHERE "2004_05" = 5088

Question: How many stations in 2011-12 had volume of 11580 in 2008-09?
SQL: SELECT COUNT("2011_12") FROM station_traffic WHERE "2008_09" = 11580

Question: What was the least volume recorded in 2011-12 when 2008-09 had 21652?
SQL: SELECT MIN("2011_12") FROM station_traffic WHERE "2008_09" = 21652