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

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'