CREATE TABLE table_32971 ("Outcome" CLOB, "Date" FLOAT, "Championship" CLOB, "Surface" CLOB, "Opponent in the final" CLOB, "Score in the final" CLOB)

What is the earliest Date on a Surface of clay in a Championship in Linz, Austria?
SELECT MIN("Date") FROM table_32971 WHERE "Surface" = 'clay' AND "Championship" = 'linz, austria'
SELECT MIN("Date") FROM "table_32971" WHERE "Championship" = 'linz, austria' AND "Surface" = 'clay'