CREATE TABLE table_203_685 (id NUMBER, "no. in\ series" NUMBER, "no. in\ season" NUMBER, "title" CLOB, "directed by" CLOB, "written by" CLOB, "original air date" CLOB)

who is the only writer to write an episode by themselves ?
SELECT "written by" FROM table_203_685 WHERE "written by" = 1
SELECT "written by" FROM "table_203_685" WHERE "written by" = 1