CREATE TABLE table_30040 ("Episode No." FLOAT, "Series No." FLOAT, "Episode" CLOB, "Director" CLOB, "Writer ( s ) " CLOB, "Original airdate" CLOB, "Viewers  ( millions ) " CLOB)

How many were the viewers (in millions) of the series no. 45?
SELECT "Viewers (millions)" FROM table_30040 WHERE "Series No." = '45'
SELECT "Viewers (millions)" FROM "table_30040" WHERE "Series No." = '45'