user: Question: If the writer is Mark Fink, who is the director?
Columns: ['No. in series', 'No. in season', 'Title', 'Directed by', 'Written by', 'Original air date']
Types: ['real', 'real', 'text', 'text', 'text', 'text']
Sample row: [69.0, 1.0, '"Greek Week"', 'Joel Zwick', 'Jeff Franklin', 'September21,1990']
SQL:

assistant: SELECT "Directed by" FROM "Table" WHERE "Written by" = 'Mark Fink';