Question: What is the location that has the 12th district?
SQL: SELECT "Location" FROM "1-19283806-4" WHERE "District" = '12th';

Question: How many election results in 2012 had a Cook PVI of D+16?
SQL: SELECT COUNT("2012 election results") FROM "1-19283806-4" WHERE "Cook PVI" = 'D+16';

Question: What is the Cook PVI for the location that has a representative of Mike Thompson?
SQL: SELECT "Cook PVI" FROM "1-19283806-4" WHERE "Representative" = 'Mike Thompson';

Question: How many locations have a median household income in 2011 of $71,479?
SQL: SELECT COUNT("Location") FROM "1-19283806-4" WHERE "Median household income (2011)" = '$71,479';

Question: What is the 2012 election results for locations whose representative is Barbara Lee?
SQL: SELECT "2012 election results" FROM "1-19283806-4" WHERE "Representative" = 'Barbara Lee';