SQL (Structured Query Language) is a language to operate databases; it includes Database Creation, Database Deletion, Fetching Data Rows, Modifying & Deleting Data rows, etc.

Our SQL tutorial helps you learn SQL (Structured Query Language) in simple and easy steps so that you can start your database programming quickly. It covers most of the important …

An SQL operator can be either a unary or binary operator. A unary operator (example unary + or unary - ) uses only one operand to perform the unary operation, whereas the binary operator …

A Primary Key in SQL is a column (or a combination of columns) that uniquely identifies each row in a table. It ensures that no two rows have the same value in the primary key column (s) and …

SQL server constantly monitors memory usage to assess resource contention (or availability); its job is to make sure that there is a certain amount of free space available at all times.

This tutorial explains some basic and advanced concepts of SQL Server such as how to create and restore data, create login and backup, assign permissions, etc. Each topic is explained …

In this chapter, we will discuss the Basic Syntax of PL/SQL which is a block-structured language; this means that the PL/SQL programs are divided and written in logical blocks of code.

The SQL GROUP BY clause is used to group (organize) rows that have the same values in specified columns into summary rows. It is used with aggregate functions like COUNT (), SUM …

SQL comments are notes you can add inside your SQL code to explain what the code does. The database ignores these comments when running queries, but they help developers read, …

A SELF JOIN is a type of join in SQL where a table is joined with itself. This is used when you need to compare rows within the same table or find relationships among data stored in a …