CREATE TABLE table_203_409 (id NUMBER, "rank" NUMBER, "representative" CLOB, "party" CLOB, "district" CLOB, "seniority date" CLOB, "notes" CLOB)

does each congressman have a party listed ?
SELECT COUNT(*) = 0 FROM table_203_409 WHERE "party" IS NULL
SELECT COUNT(*) = 0 FROM "table_203_409" WHERE "party" IS NULL