Table: episodes_19
Columns: col
original_title
directed_by
written_by
original_airdate
prod_code

Question: How many numbers have the product code of 2.6?
SQL: SELECT "col" FROM episodes_19 WHERE "prod_code" = '2.6'

Question: How many directed have the product code of 2.8?
SQL: SELECT COUNT("directed_by") FROM episodes_19 WHERE "prod_code" = '2.8'