SQL is used to declare the data to be returned, and a SQL query processor and query optimizer turn the SQL declaration into a query plan that is executed by the database engine. SQL includes a sub-language for defining schemas, the data definition language (DDL), along with a sub-...
Watch this SQL Tutorial for Beginners video What is RDBMS? RDBMS stands for Relational Database Management System. It is an information management system that is oriented on a data model. Here all the information is properly stored as tables. RDBMS Example systems are SQL Server, Oracle, MySQL...
What is a Foreign Key? If you have been using SQL or any database system for long, you know that one of the biggest advantages to a database is that, unlike a spreadsheet, it can draw data from a variety of different tables quite easily. However, to do this it must have an easy ...
What is SQL? Structured Query Language (SQL) helps you access and manipulate data in a database. Check out our guide to learn the basics of SQL!
Lesson 2: table basics. From SQLCourse.com: an interactive online training course for SQL beginners.
“Update”, “Delete”, “Create”, and “Drop” can be used to accomplish almost everything that one needs to do with a database. This tutorial will provide you with the instruction on the basics of each of these commands as well as allow you to put them to practice using the SQL ...
Remember, the table structure is a base to know in SQL. What is the field? A field will tell you about every record in a table. For example, in the above student table, the field consists of id, name, age and department. What is row or record?
Gradle is a flexible build automation tool for Java. In this blog, you will learn about its useful commands and features, and why it's better than Maven.
NoSQL database models In addition to the object database model, other non-SQL models have emerged in contrast to the relational model: The graph database model, which is even more flexible than a network model, allowing any node to connect with any other. The multivalue model, which breaks...
After completing this PL SQL tutorial, you will have a good understanding of the PL/SQL programming language. Let’s dive in!!! What Is PL/SQL PL/SQL is a fusion of SQL with procedural traits of programming languages. It was launched by Oracle to upgrade the features of SQL. PL SQL ...