CREATE TABLE publication (publication_id DECIMAL, book_id DECIMAL, publisher TEXT, publication_date TEXT, price DECIMAL)
CREATE TABLE book (book_id DECIMAL, title TEXT, issues DECIMAL, writer TEXT)

Show writers who have published a book with price more than 4000000.
SELECT T1.writer FROM book AS T1 JOIN publication AS T2 ON T1.book_id = T2.book_id WHERE T2.price > 4000000
SELECT "T1"."writer" FROM "book" AS "T1" JOIN "publication" AS "T2" ON "T1"."book_id" = "T2"."book_id" AND "T2"."price" > 4000000