CREATE TABLE table_1893 ("No. in series" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Production code" TEXT, "U.S. viewers  ( million ) " TEXT)

Name the number of production code for 5.08
SELECT COUNT("Production code") FROM table_1893 WHERE "U.S. viewers (million)" = '5.08'
SELECT COUNT("Production code") FROM "table_1893" WHERE "U.S. viewers (million)" = '5.08'