VIEW vs TABLE in SQL | Belayet Hossain

??A view is a virtual table created based on a SQL query.

→ Example: Find the employee ID, Name & department using 'employee' and 'department' tables and from the output create a VIEW with the name of 'employee_info_view'

→ Data Table:

→ Query:

→ Output:

?? Key Differences Between Table and View in SQL

→ 1. Definition:

• Table: A physical storage of data in the database.
• View: A virtual table based on a query.

→ 2. Storage:

• Table: Stores data physically.
• View: Does not store data; fetches it dynamically.

→ 3. Creation Syntax:

• Table: Created using the CREATE TABLE statement.
• View: Created using the CREATE VIEW statement.

→ 4. Data Modification:

• Table: Data can be directly inserted, updated, or deleted.
• View: Cannot modify data directly unless it's an updatable view.

→ 5. Use Case:

• Table: Used for permanent storage of structured data.
• View: Used to simplify complex queries or provide specific data views.

→ 7. Dependency:

• Table: Independent of any other structure.
• View: Dependent on the underlying tables.

→ 8. Data Updates:

• Table: Changes made to the table are permanent.
• View: Reflects changes from the underlying tables dynamically.

?? When to Use Tables:

• When you need permanent storage of data.
• When frequent updates, inserts, and deletes are required.
• When indexing and optimized data retrieval are important.

??When to Use Views:

• When simplifying complex queries or reusable logic.
• To provide specific data to users without exposing full table details.
• For security purposes, by showing only certain rows or columns.
• When dynamically displaying the latest data from underlying tables.

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