CREATE TABLE table_74219 ("No. in series" FLOAT, "No. in season" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Production code" FLOAT)

How many production codes had a total number in the season of 8?
SELECT COUNT("Production code") FROM table_74219 WHERE "No. in season" = '8'
SELECT COUNT("Production code") FROM "table_74219" WHERE "No. in season" = '8'