3rd Edition

ISBN: 9781305251038

Author: Joan Casteel

Publisher: Cengage Learning

Concept explainers

SQL stands for Structured Query Language, is a form of communication that uses queries structured in a specific format to store, manage & retrieve data from a relational database.

Queries

A query is a type of computer programming language that is used to retrieve data from a database. Databases are useful in a variety of ways. They enable the retrieval of records or parts of records, as well as the performance of various calculations prio…

Videos

Textbook Question

Chapter 4, Problem 9RQ

What is the difference between disabling a constraint and dropping a constraint?

Expert Solution & Answer

Want to see the full answer?

Check out a sample textbook solution

See solution

Chapter 4, Problem 8RQ

Chapter 4, Problem 10RQ

Students have asked these similar questions

What happens when a constraint is followed? Unique I Primary Key (ii), Default (iii), and Check (iv) Unique I Primary Key (ii), Default (iii), and Check (iv)

What is the difference between disabling a constraint and dropping a constraint? ( refer to the tables in the JustLee Books database).

( Please answer this question immediately I do not have time ) Use the following table to answer the questions below: Table name: Books Column Name Role Data Type Length Constraint bookID Stores the ID of a book Number 5 Primary key bookTitle Stores the title of a book Varchar2 50 - bookISBN Stores the ISBN of a book Number 13 Cannot be null and duplicated publicationDate Store the publication date of a book Date - Cannot be null bookPrice Stores the price of a book Number 2,2 Cannot be null a. Write in SQL a command that creates the table Books according to the above description b. Write in SQL a statement that adds a new column named publisherID of type Char(10). This column should be defined as a foreign key that relates the table Books to the table Publisher c. Write in SQL a command that deletes the books that are published before 20-Aug-2010 d. Write a SQL query that displays the number of books that are published in the year 2018 e. Write in SQL a…

Chapter 4 Solutions

Oracle 12c: SQL

Ch. 4 - What is the difference between a PRIMARY KEY...Ch. 4 - How can you verify the constraints that exist for...Ch. 4 - A table can have a maximum of how many PRIMARY KEY...Ch. 4 - Which type of constraint can be used to make...Ch. 4 - Which type of constraint should you use to ensure...Ch. 4 - How is adding a NOT NULL constraint to an existing...Ch. 4 - When must you define constraints at the table...Ch. 4 - Prob. 8RQ Ch. 4 - What is the difference between disabling a...Ch. 4 - Prob. 10RQ

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, computer-science and related others by exploring similar questions and additional content below.