user: Question: How many share values are listed for the episode with a rating/share value of 2.6/8?
Columns: ['Episode #', 'US air date', 'Rating', 'Share', 'Rating/Share (18–49)', 'Viewers (millions)']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'Thursday, April 9, 2009', '6.5', '11', '2.6/8', '10.21']
SQL:

assistant: SELECT COUNT("Share") FROM "Table" WHERE "Rating/Share (18–49)" = '2.6/8';