Q: Consider the relation, r, shown in Figure 5.22
Consider the relation, r, shown in Figure 5.22. Give the result of the following query:
See AnswerQ: Suppose you were asked to define a class Meta Display in Java
Suppose you were asked to define a class Meta Display in Java, containing a method static void print Table(String r); the method takes a relation name r as input, executes the query “select * from r”,...
See AnswerQ: Repeat Exercise 5.13 using ODBC, defining void print Table
Repeat Exercise 5.13 using ODBC, defining void print Table (char *r) as a function instead of a method.
See AnswerQ: Consider an employee database with two relations / Where the
Consider an employee database with two relations Where the primary keys are underlined. Write a function avg salary that takes a company name as an argument and ï¬nds the average salary...
See AnswerQ: Consider the relational schema / / Where the primary
Consider the relational schema Where the primary-key attributes are underlined. A tuple (p1, p2, 3) in the subpart relation denotes that the part with part id p2 is a direct subpart of the part with p...
See AnswerQ: Consider the relational schema from Exercise 5.16. Write a
Consider the relational schema from Exercise 5.16. Write a JDBC function using non recursive SQL to find the total cost of part “P-100”, including the costs of all its subparts. Be sure to take into ac...
See AnswerQ: Redo Exercise 5.12 using the language of your database system
Redo Exercise 5.12 using the language of your database system for coding stored procedures and functions. Note that you are likely to have to consult the online Documentation for your system as a refe...
See AnswerQ: Hackers may be able to fool you into believing that their web
Hackers may be able to fool you into believing that their web site is actually a web site (such as a bank or credit card web site) that you trust. This may be done by misleading email, or even by brea...
See AnswerQ: Suppose there are two relations r and s, such that the
Suppose there are two relations r and s, such that the foreign key B of r references the primary key A of s. Describe how the trigger mechanism can be used to implement the on delete cascade option wh...
See AnswerQ: Explain the difference between two-tier and three-tier application
Explain the difference between two-tier and three-tier application architectures. Which is better suited for web applications? Why?
See Answer
