CREATE TABLE table_203_405 (id NUMBER, "week" NUMBER, "date" CLOB, "opponent" CLOB, "result" CLOB, "attendance" NUMBER)

which date has the most attendance ?
SELECT "date" FROM table_203_405 ORDER BY "attendance" DESC LIMIT 1
SELECT "date" FROM "table_203_405" ORDER BY "attendance" DESC FETCH FIRST 1 ROWS ONLY