Concepts of Programming Languages (11th Edition)
11th Edition
ISBN: 9780133943023
Author: Robert W. Sebesta
Publisher: PEARSON
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Chapter 1, Problem 24RQ
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Three general methods of implementing a
The Three methods are:
- Compiler Implementation.
- Just In Time (JIT) or Interpreted Implementation.
- The combination of both compiled and interpreted implementation.
Compiled languages are usually faster during execution.
- Firstly, the program is passed to lexical analyzer which gathers different lexemes like keywords, punctuations and others of the code.
- This information is then passed to syntactic analyzer which makes parse tees out of this information.
- Further, the code is then converted to an intermediate language and the semantic errors and rectified in this stage.
- Finally, the code in this intermediate language is then converted to machine code which can be run by the system...
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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…
Consider the following relational schema. An employee can work in more than one department; the pct_time field of the Works relation shows the percentage of time that a given employee works in a given department.
Emp(eid: integer, ename: string, age: integer, salary: real)
Works(eid: integer, did: integer, pct_time: integer)
Dept(did: integer, budget: real, managerid: integer)
Write the following queries in SQL:
a. Print the name of each employee whose salary exceeds the budget of all of the departments that he or she works in.
b. Find the enames of managers who manage only departments with budgets larger than $1 million, but at least one department with budget less than $5 million.
Chapter 1 Solutions
Concepts of Programming Languages (11th Edition)
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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