CREATE TABLE table_204_94 (id DECIMAL, "outcome" TEXT, "date" TEXT, "tournament" TEXT, "surface" TEXT, "partnering" TEXT, "opponent in the final" TEXT, "score in the final" TEXT)

how many surfaces are grass ?
SELECT COUNT("surface") FROM table_204_94 WHERE "surface" = 'grass'
SELECT COUNT("surface") FROM "table_204_94" WHERE "surface" = 'grass'