user: Question: Performer 3 of Paul Merton, and a Performer 4 of Sandi Toksvig is which performer 1?
Columns: ['Date', 'Episode', 'Performer 1', 'Performer 2', 'Performer 3', 'Performer 4']
Types: ['text', 'real', 'text', 'text', 'text', 'text']
Sample row: ['10 November 1989', 1.0, 'Greg Proops', 'Josie Lawrence', 'Tony Slattery', 'Mike McShane']
SQL:

assistant: SELECT "Performer 1" FROM "Table" WHERE "Performer 3" = 'Paul Merton' AND "Performer 4" = 'Sandi Toksvig';