CREATE TABLE table_22609 ("No. in series" FLOAT, "No. in season" FLOAT, "Title" CLOB, "Directed by" CLOB, "Written by" CLOB, "Original air date" CLOB, "Production code" CLOB)

Name the number of number in series for production code of 06-04-621
SELECT COUNT("No. in series") FROM table_22609 WHERE "Production code" = '06-04-621'
SELECT COUNT("No. in series") FROM "table_22609" WHERE "Production code" = '06-04-621'