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

how many representatives share a seniority date in 1977 ?
SELECT COUNT("representative") FROM table_203_409 WHERE "seniority date" = 1977
SELECT COUNT("representative") FROM "table_203_409" WHERE "seniority date" = 1977