CREATE TABLE table_12538 ("Week" FLOAT, "Date" CLOB, "Opponent" CLOB, "Result" CLOB, "Attendance" CLOB)

Which Opponent has a Date of september 20, 1992?
SELECT "Opponent" FROM table_12538 WHERE "Date" = 'september 20, 1992'
SELECT "Opponent" FROM "table_12538" WHERE "Date" = 'september 20, 1992'