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SQL & Databases Masterclass Course

Welcome to the ultimate postgresql tutorial for beginners 2026. Work through interactive sql practice problems with solutions, master our comprehensive sql window functions tutorial modules, and prepare for tough sql interview questions at Google and Amazon entirely in your browser. Claim your course completion XP and build production-ready database mastery today!

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LESSON WORKSPACEAdvanced

SQL Lesson 24: SQL Views (Virtual Tables)

Introduction & Core Concept

A View is a virtual table based on the result-set of an SQL statement. It does not store data physically (unless it is a materialized view). Instead, it stores the query itself. Whenever you query the view, the database runs the underlying query.

Why & Where We Use It
  • Security: You can grant a user access to a view that shows only specific columns, hiding sensitive data (like salaries or passwords) in the main table.
  • Simplicity: If you have a query with 5 joins that you run every day, you can save it as a view and just run SELECT * FROM my_view;.
  • Consistency: If the business logic changes, you only need to update the view definition in one place!
    • 💡 MSSQL Tip: In Microsoft SQL Server, you can use WITH SCHEMABINDING when creating a view. This locks the underlying tables so no one can accidentally change a column name that the view relies on!
    Syntax Example
    -- Creating a View
CREATE VIEW active_users AS
SELECT id, name, country 
FROM users 
WHERE status = 'Active';

-- Querying the View
SELECT * FROM active_users WHERE country = 'USA';
    Interactive Sandboxed Terminal (Preloaded DB Schema: SHOPMART)
    SQL Query WorkspaceSQLite v3.45 (WASM Mode)
    QUICK INSERT:
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