CONCEPTS OF PROGRAMMING LANG.-TEXT
11th Edition
ISBN: 2810017678981
Author: Sebesta
Publisher: PEARSON
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Chapter 1, Problem 12PS
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There are many features a perfect programming language should have. There are many different criteria to judge programming languages.
- Programming languages with large number of features or constructs is very difficult to learn for a programmer.
- So, what programmers do is they learn only the subset of the language which is required for the current project.
- But this causes a problem in readability as if they are given someone else's code to maintain, and that person had learnt and used different subset of the same language then the our programmer will be in problem.
Also in some languages one specific operation can be done in many ways...
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Consider the following database for some store:
Customers (cid, cname, city, discount)Agents (aid, aname, city, percent)Products (pid, pname, city, quantity, price)Orders (ordno, mon, cid, aid, pid, qty, dollars)
The relation Customers records the ID (cid), name (cname), location (city) of each customer and a discount percentage (discount) for this customer.
The relation Agents records the ID (aid), name (aname), location (city) of each agent and a transaction fee (percent) charged by this agent.
The relation Products lists the ID (pid), name (pname), location (city), quantity and price of available products.
And finally, the relation Orders contains a unique order number (ordno), the month (mon), customer (cid), agent (aid), product (pid), quantity (qty) of each order as well as the total value (dollars) of the transaction.
1. Express the following query in SQL
(a) List customers (names) who do not have discounts but purchased at least one product of price greater than $50.
(b) Find…
Consider the following relational schema and briefly answer the questions that follow:
Emp(eid: integer, ename: string, age: integer, salary: real)
Works(eid: integer, did: integer, pct_time: integer)
Dept(did: integer, budget: real, managerid: integer)
a. Define a table constraint on Dept that will ensure that all managers have age > 30.
b. Write SQL statements to delete all information about employees whose salaries exceed that of the manager of one or more departments that they work in. Be sure to ensure that all the relevant integrity constraints are satisfied after your updates.
Consider the following relations:
Student(snum: integer, sname: string, rmajor: string,
level: string, age: integer)
Class(cname: string, meets_at: time, room: string, fid: integer)
Enrolled(snum: integer, cname: string)
Faculty(fid: integer, fname: string, deptid: integer)
The meaning of these relations is straightforward; for example, Enrolled has one record per student-class pair such that the student is enrolled in the class.
2. Express each of the following integrity constraints in SQL unless it is implied by the primary and foreign key constraint; if so, explain how it is implied. If the constraint cannot be expressed in SQL, say so. For each constraint, state what operations (inserts, deletes, and updates on specific relations) must be monitored to enforce the constraint.
(a) Every faculty member must teach at least two courses.
(b) Every student must be enrolled in the course called 'Math101'.
(c) A student cannot add more than two courses at a time…
Chapter 1 Solutions
CONCEPTS OF PROGRAMMING LANG.-TEXT
Ch. 1 - Why is it useful for a programmer to have some...Ch. 1 - Prob. 2RQCh. 1 - Prob. 3RQCh. 1 - Prob. 4RQCh. 1 - Prob. 5RQCh. 1 - In what language is most of UNIX written?Ch. 1 - What is the disadvantage of having too many...Ch. 1 - How can user-defined operator overloading harm the...Ch. 1 - Prob. 9RQCh. 1 - Prob. 10RQ
Ch. 1 - Describe some design trade-offs between efficiency...Ch. 1 - Prob. 12RQCh. 1 - Prob. 13RQCh. 1 - Prob. 14RQCh. 1 - Prob. 15RQCh. 1 - Prob. 16RQCh. 1 - Prob. 17RQCh. 1 - Prob. 18RQCh. 1 - Prob. 19RQCh. 1 - Prob. 20RQCh. 1 - Prob. 21RQCh. 1 - Prob. 22RQCh. 1 - Prob. 23RQCh. 1 - Prob. 24RQCh. 1 - Prob. 25RQCh. 1 - What role does the symbol table play in a...Ch. 1 - Prob. 27RQCh. 1 - Prob. 28RQCh. 1 - What are the advantages in implementing a language...Ch. 1 - Prob. 1PSCh. 1 - What are some features of specific programming...Ch. 1 - Prob. 3PSCh. 1 - Prob. 4PSCh. 1 - Prob. 5PSCh. 1 - What common programming language statement, in...Ch. 1 - Java uses a right brace to mark the end of all...Ch. 1 - Prob. 8PSCh. 1 - Explain the different aspects of the cost of a...Ch. 1 - Prob. 10PSCh. 1 - Describe some design trade-offs between efficiency...Ch. 1 - Prob. 12PSCh. 1 - Prob. 13PSCh. 1 - Prob. 14PSCh. 1 - How do type declaration statements for simple...Ch. 1 - Write an evaluation of some programming language...Ch. 1 - Prob. 17PSCh. 1 - Many contemporary languages allow two kinds of...
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