Which of the following answers is not one of the criteria suggested by the ISO 12207 for consideration during the establishment of infrastructure?
A. Functionality
B. Performance
C. Safety
D. Quality
Answer: D
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The _________________________ is the location of files that have been deleted.
Fill in the blank(s) with the appropriate word(s).
Consider a database schema with four relations: Supplier, Product, Customer, and Contracts. Both the Supplier and the Customer relations have the attributes Id, Name, and Address. An Id is a nine-digit number. Product has PartNumber (an integer between 1 and 999999) and Name. Each tuple in the Contracts relation corresponds to a contract between a supplier and a customer for a speci?c product in a certain quantity for a given price.
a. Use SQL DDL to specify the schema of these relations, including the appropriate integrity constraints (primary, candidate, and foreign key) and SQL domains. b. Specify the following constraint as an SQL assertion: there must be more contracts than suppliers.
Verify that, for any pair of relations r and s, ? cond (r × s)=r × ? cond(s) if the selection condition cond involves only the attributes mentioned in the schema of relation s.
What will be an ideal response?
A function that searches through a range for a specific value and returns the relative position of that value within the range.
What will be an ideal response?