· **MVD is a dependency caused **

– **in most cases by having several multi-valued attributes in an 1NF relation.**

– **Or, when a determinant, for example A, determines several sets of values (e.g. B and C) as shown below.**

**MVD between attributes A, B, and C in a relation using the following notation:**

** A –>**** B **

** A ****–> C**

· **MVD can be further defined as being trivial or nontrivial. **

– **MVD A ****–> B in relation R is defined as being trivial if (a) B is a subset of A ***or* (b) A **U B = R. **

– **MVD is defined as being nontrivial if neither (a) nor (b) are satisfied. **

– **Trivial MVD does not specify a constraint on a relation, while a nontrivial MVD does specify a constraint**

**Defined as a relation that is in BCNF and contains no nontrivial MVDs.**

**BranchNo ****–> Sname **

**BranchNo ****–> Oname**

**Decompose BranchStaffOwner into two tables**

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