CREATE TABLE table_50666 ("Opposing Team" CLOB, "Against" FLOAT, "Date" CLOB, "Venue" CLOB, "Status" CLOB)

Lowest against for tour match on 21 july 1990?
SELECT MIN("Against") FROM table_50666 WHERE "Status" = 'tour match' AND "Date" = '21 july 1990'
SELECT MIN("Against") FROM "table_50666" WHERE "Date" = '21 july 1990' AND "Status" = 'tour match'