Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Write prolog query: closest_common_ancestor.

 

x is a closest common ancestor of two people y and z if x is an ancestor of both y and z and no child of x is an ancestor of y and z. (A closest common ancestor of two ?rst cousins will be someone who is a grandparent of both.)

 

first_cousin(C1,C2):- parent(P1,C1), parent(P2,C2), sibling(P1,P2).

grand_parent(GP,GC):- parent(GP,P), parent(P,GC).

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