CREATE TABLE table_203_784 (id NUMBER, "no. in\ series" NUMBER, "no. in\ season" NUMBER, "performer" CLOB, "appearance" CLOB, "air date" CLOB)

how many performers appeared on the air date 21 january 2011 ?
SELECT COUNT("performer") FROM table_203_784 WHERE "air date" = '21 january 2011'
SELECT COUNT("performer") FROM "table_203_784" WHERE "air date" = '21 january 2011'