CREATE TABLE table_58396 ("Grand Prix" TEXT, "Pole Position" TEXT, "Fastest Lap" TEXT, "Winning Driver" TEXT, "Constructor" TEXT, "Report" TEXT)

What was the pole position at the san marino grand prix with michael schumacher as winning driver?
SELECT "Pole Position" FROM table_58396 WHERE "Winning Driver" = 'michael schumacher' AND "Grand Prix" = 'san marino grand prix'
SELECT "Pole Position" FROM "table_58396" WHERE "Grand Prix" = 'san marino grand prix' AND "Winning Driver" = 'michael schumacher'