CREATE TABLE table_1137704_2 (report VARCHAR2, winning_constructor VARCHAR2, grand_prix VARCHAR2)

what are all the report where winning constructor is williams - renault and grand prix is south african grand prix
SELECT report FROM table_1137704_2 WHERE winning_constructor = "Williams - Renault" AND grand_prix = "South African grand_prix"
SELECT "report" FROM "table_1137704_2" WHERE "South African grand_prix" = "grand_prix" AND "Williams - Renault" = "winning_constructor"