CREATE TABLE table_11455 ("Year" FLOAT, "Boys' Singles" TEXT, "Girls' Singles" TEXT, "Boys' Doubles" TEXT, "Girls' Doubles" TEXT, "Mixed Doubles" TEXT)

Which girls singles in 2012?
SELECT "Girls' Singles" FROM table_11455 WHERE "Year" = '2012'
SELECT "Girls' Singles" FROM "table_11455" WHERE "Year" = '2012'