-- Database schema
| publication : Publication_ID [ INT ] primary_key , Book_ID [ INT ] publication.Book_ID = book.Book_ID , Publisher [ TEXT ] , Publication_Date [ TEXT ] , Price [ INT ] | book : Book_ID [ INT ] primary_key , Title [ TEXT ] , Issues [ INT ] , Writer [ TEXT ] |
-- -- Show the publishers that have publications with price higher than 10000000 and publications with price lower than 5000000.

SELECT Publisher FROM publication WHERE Price  >  10000000 INTERSECT SELECT Publisher FROM publication WHERE Price  <  5000000;