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GATE | GATE-CS-2001 | Question 24
Suppose the adjacency relation of vertices in a graph is represented in a table Adj(X,Y). Which of the following queries cannot be expressed by a relational algebra expression of constant length?
(A)
List of all vertices adjacent to a given vertex
(B)
List all vertices which have self loops
(C)
List all vertices which belong to cycles of less than three vertices
(D)
List all vertices reachable from a given vertex
Answer
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