An E-r Diagram Can Be Viewed As A Graph.what Do The Following Mean In

1.	An E-r Diagram Can Be Viewed As A Graph.what Do The Following Mean In Terms Of The Structure Of An Enterprise Schema? the Graph Is Disconnected.< the Graph Is Acyclic.
Answer» If a pair of entity sets are CONNECTED by a path in an E-R diagram, the entity sets are related, though PERHAPS indirectly. A DISCONNECTED graph implies that there are pairs of entity sets that are unrelated to each other. If we split the graph into connected components, we have, in effect, a separate database corresponding to each connected component. As indicated in the answer to the previous part, a path in the graph between a pair of entity sets indicates a (possibly indirect) relationship between the two entity sets. If there is a cycle in the graph then every pair of entity sets on the cycle are related to each other in at least two distinct WAYS. If the E-R diagram is ACYCLIC then there is a unique path between every pair of entity sets and, thus, a unique relationship between every pair of entity sets.

An E-r Diagram Can Be Viewed As A Graph.what Do The Following Mean In Terms Of The Structure Of An Enterprise Schema? the Graph Is Disconnected.< the Graph Is Acyclic.

Answer»

If a pair of entity sets are CONNECTED by a path in an E-R diagram, the entity sets are related, though PERHAPS indirectly. A DISCONNECTED graph implies that there are pairs of entity sets that are unrelated to each other. If we split the graph into connected components, we have, in effect, a separate database corresponding to each connected component.
As indicated in the answer to the previous part, a path in the graph between a pair of entity sets indicates a (possibly indirect) relationship between the two entity sets. If there is a cycle in the graph then every pair of entity sets on the cycle are related to each other in at least two distinct WAYS. If the E-R diagram is ACYCLIC then there is a unique path between every pair of entity sets and, thus, a unique relationship between every pair of entity sets.