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Equivalencia de Consultas<br />
Π ENAME<br />
31<br />
σ JNAME = “CAD/CAM” ∧ (DUR = 12 OR DUR = 24) ∧ ENAME ≠ “J.DOE”<br />
JNO ∧ ENO<br />
X<br />
G J E<br />
Dr. Víctor J. Sosa Sosa<br />
Restructuración<br />
Π ENAME<br />
JNO<br />
Π JNO, ENAME<br />
32<br />
ENO<br />
Π JNO<br />
Π JNO, ENO Π ENO, ENAME<br />
σ JNAME = “CAD/CAM” σ DUR = 12 OR DUR = 24<br />
σ ENAME ≠ “J.DOE”<br />
J<br />
G<br />
E<br />
Dr. Víctor J. Sosa Sosa
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