A relational schema is in fourth normal form if the determinant of every non-trivial multivalued dependency is a superkey. This implies Boyce-Codd normal form because every functional dependency implies a multivalued dependency.
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Fourth Normal Form (4NF) is a type of database normalization used to minimize redundancy and dependency by organizing data in a relational database. A database table is said to be in Fourth Normal Form if it meets the following criteria: 1. **It is in Boyce-Codd Normal Form (BCNF)**: Before a table can be in 4NF, it must first satisfy all the conditions of BCNF.