CREATE TABLE table_77237 ("Opposing Team" CLOB, "Against" FLOAT, "Date" CLOB, "Venue" CLOB, "Status" CLOB)

What was the average of againsts on 21/5/1997?
SELECT AVG("Against") FROM table_77237 WHERE "Date" = '21/5/1997'
SELECT AVG("Against") FROM "table_77237" WHERE "Date" = '21/5/1997'