17 Questions
What is the purpose of VIEW AUTHORIZATION in SQL?
To hide certain attributes or tuples from unauthorized access.
How can you drop a table in SQL using the DROP command?
DROP TABLE TABLE_NAME;
What can be changed using the ALTER command in SQL?
The definition of a base table or other named schema elements.
What are the outcomes of learning SQL according to the text?
Creating tables, inserting data, giving constraints, using basic commands, and writing queries.
List the data types allowed for SQL attributes.
Various data types like integer, char, varchar, etc.
Explain the CREATE TABLE SQL command and provide examples of different data definitions.
CREATE TABLE is used to create a new table in SQL. It includes specifying columns and their data types.
What is view materialization in SQL?
View materialization involves physically creating a temporary or permanent view table when the view is first queried or created.
When is a view with a single defining table considered updatable?
A view with a single defining table is updatable if the view attributes contain the primary key of the base relation, as well as all attributes with the NOT NULL constraint that do not have default values specified.
Why are views defined on multiple tables using joins generally not updatable?
Views defined on multiple tables using joins are generally not updatable because the underlying data may not be uniquely identifiable for updates.
What is an inline view in SQL?
An inline view in SQL is a view that is defined within the scope of a single SQL statement and is not stored in the database schema.
Can views defined using grouping and aggregate functions be updated in SQL?
No, views defined using grouping and aggregate functions are not updatable in SQL.
What is the purpose of the NOT NULL constraint in SQL?
To ensure that a column cannot contain NULL values.
How can you specify a default value for an attribute in SQL?
By appending the DEFAULT clause to the attribute definition.
What is the CHECK constraint used for in SQL?
To restrict domain or attribute values based on specified conditions.
Explain the concept of Views in SQL.
Views are virtual tables derived from other tables in the database.
What is the difference between view implementation and view materialization in SQL?
View implementation creates a logical view, while view materialization creates a physical copy of the view.
What is view authorization in SQL?
View authorization defines who has access to a view and what operations they can perform on it.
Test your knowledge on SQL commands related to schema authorization and alterations. This quiz covers topics such as VIEW authorization, DROP command, and ALTER command for modifying schema elements like tables and columns.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
