user: Question: what's the minimum production code written by Jay Sommers & Dick Chevillat and Al Schwartz
Columns: ['No. in series', 'No. in season', 'Title', 'Directed by', 'Written by', 'Original air date', 'Production code']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'real']
Sample row: [33.0, 1.0, '"Wings Over Hooterville"', 'Richard L. Bare', 'Jay Sommers and Dick Chevillat', 'September14,1966', 33.0]
SQL:

assistant: SELECT MIN("Production code") FROM "Table" WHERE "Written by" = 'Jay Sommers & Dick Chevillat and Al Schwartz';