What is the district code for the School that does not offer a magnet program in the city of Fresno?
When magent is equal to 0 in the database, it means ths school doesn't offer a magnet program.
SELECT T1.`District Code` FROM frpm AS T1 INNER JOIN schools AS T2 ON T1.CDSCode = T2.CDSCode WHERE T2.City = 'Fresno' AND T2.Magnet = 0