user: Question: How many episodes in the series are also episode 18 in the season?
Columns: ['No. in series', 'No. in season', 'Title', 'Directed by', 'Written by', 'Original air date', 'U.S. viewers (millions)']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'text']
Sample row: [103.0, 1.0, '" Good Mourning "', 'Ed Ornelas', 'Krista Vernoff', 'September24,2009', '17.03']
SQL:

assistant: SELECT COUNT("No. in series") FROM "Table" WHERE "No. in season" = 18.0;