CREATE TABLE publication (Book_ID VARCHAR, Price INT)
CREATE TABLE book (Writer VARCHAR, Book_ID VARCHAR)

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