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I am Egyptian citizen holding a single entry visa to Spain , travelling in 1 July but i will have 1 day transit in Swiss airport , so do i need a visa to enter Switzerland ?
No you don't. Switzerland is in the Schengen zone, that will be your point of entry into Schengen. Your further flight from Switzerland to Spain is a flight inside Schengen zone, which means no passport checks by immigrations/customs.