CREATE TABLE table_204_599 (id DECIMAL, "party" TEXT, "first duma" TEXT, "second duma" TEXT, "third duma" TEXT, "fourth duma" TEXT)

how many parties were represented in the third duma ?
SELECT COUNT("party") FROM table_204_599 WHERE NOT "second duma" IS NULL
SELECT COUNT("party") FROM "table_204_599" WHERE NOT "second duma" IS NULL