user: Question: List all directors from episodes with viewership of 1.945 million.
Columns: ['No.', 'Title', 'Directed by', 'Written by', 'Original air date', 'Production code', 'Viewers (in millions)']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, '"Pilot"', 'Todd Holland', 'Greg Bratman & Tommy Dewey', 'March11,2010 (CAN) March14,2010 (US)', '1ARK79', '4.514']
SQL:

assistant: SELECT "Directed by" FROM "Table" WHERE "Viewers (in millions)" = '1.945';