CREATE TABLE table_7318 ("Outcome" TEXT, "Date" FLOAT, "Tournament" TEXT, "Surface" TEXT, "Partner" TEXT, "Opponent in the final" TEXT, "Score in the final" TEXT)

What is the earliest Date David Adams played on a Clay Surface with Brett Steven as Partner?
SELECT MIN("Date") FROM table_7318 WHERE "Surface" = 'clay' AND "Partner" = 'brett steven'
SELECT MIN("Date") FROM "table_7318" WHERE "Partner" = 'brett steven' AND "Surface" = 'clay'