user: Question: How many episodes were titled "Identity Crisis"?
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: [24.0, 1.0, '"Burked"', 'Danny Cannon', 'Carol Mendelsohn & Anthony E. Zuiker', 'September27,2001', '22.30']
SQL:

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