user: Question: How many different people directed the episode titled "Fail Fish"?
Columns: ['No. in series', 'Title', 'Directed by', 'Story & Storyboards by', 'Original air date', 'U.S. viewers (millions)']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, '"Bea Stays in the Picture"', 'Maxwell Atoms', 'Tim McKeon (story) Maxwell Atoms (storyboards)', 'September3,2010', '4.8']
SQL:

assistant: SELECT COUNT("Directed by") FROM "Table" WHERE "Title" = '"Fail Fish"';