CREATE TABLE table_29446 ("Episode" CLOB, "Date" CLOB, "Official ITV rating  ( millions ) " CLOB, "Weekly rank" FLOAT, "Share  ( % ) " CLOB, "Official ITV HD rating  ( millions ) " CLOB, "Total ITV viewers  ( millions ) " CLOB)

What were the official itv ratings in millions for semi-final 5?
SELECT "Official ITV rating (millions)" FROM table_29446 WHERE "Episode" = 'Semi-final 5'
SELECT "Official ITV rating (millions)" FROM "table_29446" WHERE "Episode" = 'Semi-final 5'