Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_13403120_1 ( prodcode VARCHAR, originalairdate VARCHAR )

### Question ###
what is the prod.code of the episode with original air date 01/12/1968?

### Accurate SQL ###

SELECT COUNT(prodcode) FROM table_13403120_1 WHERE originalairdate = "01/12/1968"