CREATE TABLE table_52750 ("Outcome" CLOB, "Date" CLOB, "Tournament" CLOB, "Surface" CLOB, "Opponent" CLOB, "Score" CLOB)

Which surface has a Date of 22 august 2006?
SELECT "Surface" FROM table_52750 WHERE "Date" = '22 august 2006'
SELECT "Surface" FROM "table_52750" WHERE "Date" = '22 august 2006'