Database-Management-System
August 29, 2024Database-Management-System
August 29, 2024Database-Management-System
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Question 696
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A relation that is not of connected model but is made visible to a user as a virtual relation is called:
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Table
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Query
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View
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Joined relations
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Question 696 Explanation:
→ In SQL, a view is a virtual table based on the result-set of an SQL statement.
→ A view contains rows and columns, just like a real table. The fields in a view are fields from one or more real tables in the database.
→ You can add SQL functions, WHERE, and JOIN statements to a view and present the data as if the data were coming from one single table.
CREATE VIEW Syntax:
CREATE VIEW view_name AS
SELECT column1, column2, …
FROM table_name
WHERE condition;
Note:
A view always shows up-to-date data! The database engine recreates the data, using the view’s SQL statement, every time a user queries a view.
→ A view contains rows and columns, just like a real table. The fields in a view are fields from one or more real tables in the database.
→ You can add SQL functions, WHERE, and JOIN statements to a view and present the data as if the data were coming from one single table.
CREATE VIEW Syntax:
CREATE VIEW view_name AS
SELECT column1, column2, …
FROM table_name
WHERE condition;
Note:
A view always shows up-to-date data! The database engine recreates the data, using the view’s SQL statement, every time a user queries a view.
Correct Answer: C
Question 696 Explanation:
→ In SQL, a view is a virtual table based on the result-set of an SQL statement.
→ A view contains rows and columns, just like a real table. The fields in a view are fields from one or more real tables in the database.
→ You can add SQL functions, WHERE, and JOIN statements to a view and present the data as if the data were coming from one single table.
CREATE VIEW Syntax:
CREATE VIEW view_name AS
SELECT column1, column2, …
FROM table_name
WHERE condition;
Note:
A view always shows up-to-date data! The database engine recreates the data, using the view’s SQL statement, every time a user queries a view.
→ A view contains rows and columns, just like a real table. The fields in a view are fields from one or more real tables in the database.
→ You can add SQL functions, WHERE, and JOIN statements to a view and present the data as if the data were coming from one single table.
CREATE VIEW Syntax:
CREATE VIEW view_name AS
SELECT column1, column2, …
FROM table_name
WHERE condition;
Note:
A view always shows up-to-date data! The database engine recreates the data, using the view’s SQL statement, every time a user queries a view.