In PostgreSQL, a table is a collection of data stored in a structured format with columns and rows, while a view is a virtual table created based on the result set of a predefined SQL query.
When you have a large amount of data that needs to be stored and accessed frequently, a table is the best option. You can create new tables, modify their contents, add or remove rows, and perform complex queries on them easily. Here is an example of creating a table in PostgreSQL using Java:
try (Connection conn = DriverManager.getConnection(url, username, password);
Statement stmt = conn.createStatement()) {
String createTable = "CREATE TABLE myTable (id SERIAL PRIMARY KEY, name VARCHAR(50), age INT)";
stmt.executeUpdate(createTable);
}On the other hand, a view is a virtual table that is derived from one or more tables or other views. Views do not store data separately; rather, they provide a mechanism to retrieve data from existing tables and customize it according to specific requirements. Views have the advantage of simplifying access to frequently used data, hiding the complexity of underlying tables, and providing an additional level of security by restricting the views access to the underlying tables. Here is an example of creating a view in PostgreSQL using Java:
try (Connection conn = DriverManager.getConnection(url, username, password);
Statement stmt = conn.createStatement()) {
String createView = "CREATE VIEW myView AS SELECT name, age FROM myTable WHERE age > 20";
stmt.executeUpdate(createView);
}In summary, use a table when you need to store a large amount of data that requires frequent processing and modification, and use a view when you need to simplify access to data by creating a virtual table that hides the complexity of underlying tables or restricts access to sensitive data.