Have you ever needed to convert a set of data from rows into columns? You can do this using the Oracle PIVOT feature (and the reverse using Oracle UNPIVOT).
As a Java developer, it’s very likely you’ll need to connect to a database.
There are several ways to do this in Java, from creating a simple connection using JDBC in Java to using a complete framework for managing data storage or persistence.
Improve your knowledge of Java and database connections with this collection of guides and resources.
Creating a database is easy.
Designing an effective database, the right way, using good practices, is hard.
In this article, I’ve listed 24 different database design mistakes that you should try to avoid.
By the end of this article, you’ll know all about views, materialized views, how to create them, their advantages, and much more.
The SQL DISTINCT keyword lets you find unique rows.
By the end of this article, you’ll know how to use it, what it can do, and understand several different examples.
Are you wondering what set operators are?
Have you seen keywords like UNION or MINUS and want to know what they do and why they are used?
In this article, you’ll learn all about set operators such as these, why they are used, and see some examples.
Do you want to know the different ways of comparing data in SQL, using operators?
SQL operators include EXISTS, IN, LIKE, BETWEEN, and many more. We’ll look at each of them in this guide.
By the end of the guide, you’ll have a solid understanding of these operators and will be able to use them in your own SQL code.
Do you want to know what a stored procedure is, how it can help your SQL, and how to create one?
Read this guide to find out all of those, and more.
Natural key, surrogate key, composite key.
What do these terms mean? And why should you know what they are?
In this article, you’ll learn what these terms are, so you can communicate better with other developers and understand other online tutorials that use these terms.
Do you need to insert or update data depending on if it already exists?
You can do this with the MERGE statement in Oracle SQL.