Querying through views in SQL - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a SQL view?

A SQL view is like a saved query. It looks like a table but does not store data itself. It shows data from one or more tables when you ask it.

beginner

How do you query data from a view?

You use a SELECT statement just like with a normal table. For example: SELECT * FROM view_name;

beginner

Can you filter data when querying a view?

Yes! You can add WHERE, ORDER BY, and other clauses to a query on a view to get only the data you want.

beginner

Does a view store data permanently?

No, a view does not store data. It shows data from the underlying tables each time you query it.

intermediate

Why use views instead of tables?

Views help simplify complex queries, hide details, and provide a consistent way to see data without copying it.

What does a SQL view represent?

A A saved query that looks like a table

B A physical table storing data

C A backup of a database

D A user account in the database

A view is a saved query that shows data from tables but does not store data itself.

How do you get data from a view named 'employee_view'?

A SELECT * FROM employee_view;

B GET employee_view;

C SHOW employee_view;

D OPEN employee_view;

You use SELECT * FROM view_name; to query data from a view.

Can you use WHERE clause when querying a view?

A Only with special permissions

B No, views do not support filtering

C Only if the view is indexed

D Yes, just like with tables

Views behave like tables in queries, so you can filter data with WHERE.

Does a view store data permanently?

A Only if created with special options

B Yes, it stores a copy of data

C No, it shows data from tables dynamically

D Yes, but only for a short time

Views do not store data; they show current data from underlying tables.

Which is a benefit of using views?

A Increase storage space

B Simplify complex queries

C Make data permanent

D Replace tables completely

Views help simplify queries and hide complexity without storing data.

Explain what a SQL view is and how you can use it to get data.

Think of a view as a window to see data from tables.

Describe why views are useful in databases.

Consider how views help users see data easily without changing tables.