CREATE TABLE table_18857 ("District" TEXT, "2012 Commission" TEXT, "2010 Commission" TEXT, "2007 Commission" TEXT, "2002 Commission" TEXT, "1999 Commission" TEXT)

What district for charlie oliver of the 2012 commission?
SELECT "District" FROM table_18857 WHERE "2012 Commission" = 'Charlie Oliver'
SELECT "District" FROM "table_18857" WHERE "2012 Commission" = 'Charlie Oliver'