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Module 13 – Solutions 13.11
CREATE VIEW ExpensiveParts (partNo)
AS SELECT DISTINCT partNo
FROM Part
WHERE partCost > 1000;
Discuss how you would maintain this as a materialized view and under what
circumstances you would be able to maintain the view without having to access the
underlying base table Part.
If a row is inserted into Part with a partCost less than or equal to £1000, the view would
not have to be updated. If a partNo is inserted into Part that is already in the view, no
new record has to be inserted into the view (because of the DISTINCT keyword).
Similarly for update. If a partNo is deleted from Part have to access the underlying base
table to check if there is another partNo with same value, to determine whether row
should be deleted from the view.
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13.4 Chapter 9 Database Planning, Design, and
Administration
Solutions and hints of some exercises
9.14 The student should follow the approach to DBMS selection described in Section 9.7
and produce a report that identifies a suitable DBMS product that meets the requirements
of the organization. The selection should be fully justified and any assumptions made
should be highlighted.
9.15 The student should follow the approach to DBMS selection described in Section 9.7
and produce a report that identifies a suitable DBMS product that meets the requirements
of each organization described in Appendix B. The selection should be fully justified
and any assumptions made about the case study should be highlighted.
9.16 The student should investigate the organization and identify whether data administration
and database administration exist as distinct functional areas. However, the student
should be careful to note that these functions may be named differently, merged as a
single function, or included as part of a larger IT/IS function. If identified, the student
should compile a report documenting the organization, responsibilities, and tasks.
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13.5 Chapter 10 Fact-Finding Techniques
Solutions and hints of some exercises