user: Question: Date of 15 July 1994 involves which performer 3?
Columns: ['Date', 'Episode', 'Performer 1', 'Performer 2', 'Performer 3', 'Performer 4']
Types: ['text', 'real', 'text', 'text', 'text', 'text']
Sample row: ['1 July 1994', 1.0, 'Stephen Frost', 'Colin Mochrie', 'Ryan Stiles', 'Tony Slattery']
SQL:

assistant: SELECT "Performer 3" FROM "Table" WHERE "Date" = '15 July 1994';