CREATE TABLE table_57067 ("Grand Prix" CLOB, "Date" CLOB, "Location" CLOB, "Pole Position" CLOB, "Fastest Lap" CLOB, "Winning Driver" CLOB, "Constructor" CLOB, "Report" CLOB)

On what date did Ayrton Senna win at Imola?
SELECT "Date" FROM table_57067 WHERE "Winning Driver" = 'ayrton senna' AND "Location" = 'imola'
SELECT "Date" FROM "table_57067" WHERE "Location" = 'imola' AND "Winning Driver" = 'ayrton senna'