user: Question: What is the average Episode # with a 7 share and 18–49 is less than 2 and the Air Date of May 21, 2009?
Columns: ['Episode #', 'Title', 'Air Date', 'Rating', 'Share', '18–49', 'Viewers', 'Rank']
Types: ['real', 'text', 'text', 'real', 'real', 'real', 'real', 'text']
Sample row: [42.0, '"The Manhattan Project"', 'September 25, 2008', 6.6, 11.0, 3.3, 9.77, '#26']
SQL:

assistant: SELECT AVG("Episode #") FROM "Table" WHERE "Share" = 7.0 AND "18–49" < 2.0 AND "Air Date" = 'May 21, 2009';