Computer Sciene of Udayana State University

April 26, 2009

2NF to 3NF

Filed under: Computer Science — ignaga @ 2:07 AM
  • Identify FD’s in the relation.
  • If transitive dependencies exist on the primary key remove them by placing them in a new relation along with copy of their determinant.

EMP_DEPT(Enum, Ename, Sal, Dnum, Dname, Mgr)

Enum–>{Ename, Sal, Dnum}, Dnum–>{Dname, Mgr}

second FD is transitive through Dnum

Decompose EMP_DEPT into

EMP(Enum, Ename, Sal, Dnum) and DEPT(Dnum, Dname, Mgr)

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