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Objectives
After reading this part, you should be able to:
Determine the steps of path in association network You can analyse use of paths in association network in the following steps: Examine every operation and see what asso
Determine the rule that a value of a foreign key should appear as a value of some particular table is called a Ans: Referential constraint. The rule that a value of a fo
Explain the two types of participation constraint. 1. Total: The participation of an entity set E in a relationship set R is said to be total if each entity in E participates i
Nested Queries Let us see some more complex queries in this section. Sub-queries: Some of the basic concerns of sub-queries are: A sub-query is a SELECT statemen
What is storage manager? A storage manager is a program module that gives the interface among the low level data keeps in a database and the application programs and queries su
About Attribute inheritance
Question: This question refers to the database schema. a) Express the following queries in SQL: (i) Write the SQL code that will create the table Company. Your answer sh
In tuple relational calculus P1 → P2 is equivalent to ? A In tuple relational calculus P1→ P2 is equivalent to ¬P1 V P2. (The logical implication expression A B, meaning
explain the mapping constraints
Describe the various types of Online Analytical Processing (OLAP) tools and briefly discuss how the support common analytical operations.
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