Problems with 4NF Schema 4NF design requires users to includejoins in their queries. 1NF relational view flat-books defined by join of 4NF relations: eliminates the need for users to perform joins, but loses the one-to-one correspondence between tuples and documents. And has a large amount of redundancy Nested relations representation is much more natural here. Database System Concepts-5th Edition,Aug 9,2005. 9.8 @Silberschatz,Korth and SudarshanDatabase System Concepts - 5 9.8 ©Silberschatz, Korth and Sudarshan th Edition, Aug 9, 2005. Problems with 4NF Schema 4NF design requires users to include joins in their queries. 1NF relational view flat-books defined by join of 4NF relations: eliminates the need for users to perform joins, but loses the one-to-one correspondence between tuples and documents. And has a large amount of redundancy Nested relations representation is much more natural here