CREATE TABLE table_17542 ("No. in series" FLOAT, "No. in season" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Production code" FLOAT)

what's the minimum production code written by jay sommers & dick chevillat and al schwartz
SELECT MIN("Production code") FROM table_17542 WHERE "Written by" = 'Jay Sommers & Dick Chevillat and Al Schwartz'
SELECT MIN("Production code") FROM "table_17542" WHERE "Written by" = 'Jay Sommers & Dick Chevillat and Al Schwartz'