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Q&A for students, teachers, and linguists wanting to discuss the finer points of the Chinese language

select DISTINCT OwnerUserId
from Posts 
where PostTypeId= 2 and year(CreationDate)= 2014	-- из выборки ответов в 2014
EXCEPT                                            		   	-- убираем 
select DISTINCT  OwnerUserId                      	    	-- выборку вопросов в 2015
from Posts
where PostTypeId= 1 and year(CreationDate)= 2015

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edited dec 3

created dec 3 jon.doe46476