CREATE TABLE table_55450 ("Date" CLOB, "Tournament" CLOB, "Winning score" CLOB, "To par" CLOB, "Margin of victory" CLOB, "Runner ( s ) -up" CLOB)

What tournament took place on 7 Aug 2011?
SELECT "Tournament" FROM table_55450 WHERE "Date" = '7 aug 2011'
SELECT "Tournament" FROM "table_55450" WHERE "Date" = '7 aug 2011'