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SQL Simplified: A Complete Walk-Through of Views and Their Power

published 4 days, 12 hours, 39 minutes ago posted by DhruvDhruv 13 days, 12 hours, 21 minutes ago
Wednesday, February 1, 2023 3:19:08 PM GMT Monday, January 23, 2023 3:37:49 PM GMT

The blog post discusses the concept of views in SQL and provides a comprehensive introduction and walk-through of how to use them. The article begins by explaining what views are and their purpose. Views are virtual tables that can be created from one or more existing tables in a database, and are used to simplify the complexity of the underlying tables. They allow developers to present a specific subset of data to users, without giving them access to the underlying tables.

The article then goes on to explain how to create a view in SQL, using the CREATE VIEW statement. The syntax for creating a view is provided, as well as an example of creating a view from a table. The article also mentions how to update a view by using the ALTER VIEW statement and how to drop a view by using the DROP VIEW statement.

The post also explains how to query a view, just like a regular table, using SELECT statement. It also discusses the difference between a SELECT statement on a table and a SELECT statement on a view. When a SELECT statement is run on a table, it returns all the rows and columns of the table, but when a SELECT statement is run on a view, it only returns the rows and columns that are specified in the view's SELECT statement.

The post also mentions the benefits of using views in SQL, they include:

  • Simplifying complex queries
  • Hiding sensitive data
  • Providing a consistent data access layer
  • Enforcing security
  • Creating a customized user interface

The post concludes by providing a summary of the key takeaways from the article, including the purpose of views, how to create, update and drop a view, and how to query a view. It also mentions the benefits of using views in SQL and how they can be used to simplify the complexity of underlying tables and to enforce security.

In brief this post provides an overall introduction on SQL views, which are virtual tables that can be created from one or more existing tables. It covers the syntax and examples of how to create, update and drop views, and how to query a view. The post also highlighted the advantages of using views such as simplifying complex queries, hiding sensitive data, and enforcing security.

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