DBMS Korth Edition 6 Exercise 7 Question 8 (Page No. 317)

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DBMS Korth Edition 6 Exercise 7 Question 12 (Page No. 317-318)
Figure shows a lattice structure of generalization and specialization (attributes not shown). For entity sets A, B, and C, explain how attributes are inherited from the higher-level entity sets X and Y. Discuss how to handle a case where an attribute of X has the same name as some attribute of Y.

Figure shows a lattice structure of generalization and specialization(attributes not shown). For entity sets A, B, and C, explain how attributes are inherited from the hi...

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DBMS Korth Edition 6 Exercise 7 Question 11 (Page No. 317)
In SQL, foreign key constraints can only reference the primary key attributes of the referenced relation, or other attributes declared to be a super key using the unique constraint. As a result, total participation constraints on a ... 4.4.7 of korth). (Unfortunately, these features are not supported on any widely used database currently.)

In SQL, foreign key constraints can only reference the primary key attributesof the referenced relation, or other attributes declared to be a super key usingthe unique co...

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DBMS Korth Edition 6 Exercise 7 Question 10 (Page No. 317)
Consider a many-to-one relationship R between entity sets A and B. Suppose the relation created from R is combined with the relation created from A. In SQL, attributes participating in a foreign key constraint can be null. Explain how a constraint on total participation of A in R can be enforced using not null constraints in SQL.

Consider a many-to-one relationship R between entity sets A and B. Supposethe relation created from R is combined with the relation created fromA. In SQL, attributes part...

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DBMS Korth Edition 6 Exercise 7 Question 9 (Page No. 317)
Suppose the advisor relationship was one-to-one. What extra constraints are required on the relation advisor to ensure that the one-to-one cardinality constraint is enforced?

Suppose the advisor relationship was one-to-one. What extra constraintsare required on the relation advisor to ensure that the one-to-one cardinalityconstraint is enforce...

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DBMS Korth Edition 6 Exercise 7 Question 8 (Page No. 317)

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