select distinct employeeid from orders where orderid in ( select orderid from orderdetails where discount >= 10)
select custID from orders where regionID != "E" and discount > any (select discount from orders where regionID = "E" and discount > 3)
select pub.name from publishers pub where exists (select pubid from titles where titles.pubid = pub.pubid and toLowerCase(titles.subject) like "%psychology%");
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