CREATE TABLE table_12812 ("Week" FLOAT, "Date" CLOB, "Opponent" CLOB, "Result" CLOB, "Game site" CLOB, "Record" CLOB, "Attendance" FLOAT)

Who was the opponent at the week 4 game?
SELECT "Opponent" FROM table_12812 WHERE "Week" = '4'
SELECT "Opponent" FROM "table_12812" WHERE "Week" = '4'