April 2002
Intermediate to advanced
336 pages
9h 58m
English
Content preview from Mastering Oracle SQLBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Preface
SQL, which stands for Structured Query Language, is the language for accessing a relational database. SQL provides a set of statements for storing and retrieving data to and from a relational database. It has gained steadily in popularity ever since the first relational database was unleashed upon the world. Other languages have been put forth, but SQL is now accepted as the standard language for almost all relational database implementations, including Oracle.
SQL is different from other programming languages because it is nonprocedural. Unlike programs in other languages, where you specify the sequence of steps to be performed, a SQL program (more appropriately called a SQL statement) only expresses the desired result. The responsibility for determining how the data will be processed in order to generate the desired result is left to the database management system. The nonprocedural nature of SQL makes it easier to access data in application programs.
If you are using an Oracle database, SQL is the interface you use to access the data stored in your database. SQL allows you to create database structures such as tables (to store your data), views, and indexes. SQL allows you to insert data into the database, and to retrieve that stored data in a desired format (for example, you might sort it). Finally, SQL allows you to modify, delete, and otherwise manipulate your stored data. SQL is the key to everything you do with the database. It’s important to know how to get the ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.