CREATE TABLE table_13403120_1 (prodcode VARCHAR2, originalairdate VARCHAR2)

what is the prod.code of the episode with original air date 01/12/1968?
SELECT COUNT(prodcode) FROM table_13403120_1 WHERE originalairdate = "01/12/1968"
SELECT COUNT("prodcode") FROM "table_13403120_1" WHERE "01/12/1968" = "originalairdate"