CREATE TABLE table_204_287 (id NUMBER, "outcome" CLOB, "no." NUMBER, "date" NUMBER, "championship" CLOB, "surface" CLOB, "opponent in the final" CLOB, "score in the final" CLOB)

how many courts are clay ?
SELECT COUNT(*) FROM table_204_287 WHERE "surface" = 'clay'
SELECT COUNT(*) FROM "table_204_287" WHERE "surface" = 'clay'