List of best-selling singles

Columns: Artist | Single | Released | Sales ( in millions )
Ariana Grande featuring Iggy Azalea | Problem | 2014 | 9 | Madonna | Hung Up | 2005 | 9 | Thelma Aoyama | Soba ni Iru ne | 2008 | 8.7 | Imagine Dragons | Radioactive | 2012 | 8.6 | Magic ! | Rude | 2014 | 8.6 | Black Eyed Peas | Boom Boom Pow | 2009 | 8.5

Example questions:
When was the best-selling digital single by the duo from Columbus , Ohio released ? | Which best-selling digital single was recorded by the singer known as the Queen of Pop ? | What was the sales in millions of the best-selling digital song from the album Blurryface ? | Which best-selling digital single was recorded by the artist born on October 8 , 1985 ? | What was the sales in millions of the best-selling digital song recorded by an American singer-songwriter for her fifth studio album ?

Answers:
2015 | Hung Up | 9.9 | That 's What I Like | 9.2