user: Question: How many original air dates were there for episode 17?
Columns: ['No. in season', 'No. disc', 'Title', 'Directed by', 'Written by', 'Original air date']
Types: ['real', 'real', 'text', 'text', 'text', 'text']
Sample row: [1.0, 1.0, '"The Serpent\'s Lair (4)"', 'Jonathan Glassner', 'Brad Wright', 'June26,1998 ( Showtime )']
SQL:

assistant: SELECT COUNT("Original air date") FROM "Table" WHERE "No. in season" = 17.0;