Understanding SQL Views and How SQL Compares to Java

In SQL, a view is like a “virtual table.” It looks and acts a lot like a real table—you can run SELECT queries against it, join it with other tables, and use it to simplify complex queries. A view is created with a saved query, and whenever you use the view, the database runs that query in the background.

Views are similar to tables because they let you organize and present data in rows and columns. But they are different in important ways. A view usually does not store data itself, so it does not have a primary key. This also means you often cannot do direct insert, update, or delete operations on a view unless it meets special rules (like being based on a single table without joins). In most cases, views are for reading and organizing data, not for changing it.

As we wrap up our SQL study, it’s useful to compare SQL with a language like Java. Both can filter data or control what is returned. For example, a Java if statement is a little like an SQL WHERE clause—they both decide which data or values to keep. The SQL SELECT clause is like a Java return statement, because it decides what information comes back from the query.

At the same time, there are big differences. Java is procedural and tells the computer how to do things step by step, while SQL is declarative and tells the database what result we want, leaving the “how” to the database engine. SQL also has its own unique features like joins, aggregations, and set operations, while Java has loops, classes, and object-oriented tools that SQL doesn’t. In short, SQL and Java share some ideas but serve different purposes. SQL focuses on data and queries, while Java focuses on logic and applications.