SQL Language Tutorial

SQL is designed to manage data in relational database management systems.

SQL stands for Structured Query Language. SQL is a standard programming language designed specifically for storing, retrieving, managing, or processing data in a relational database management system (RDBMS). SQL was introduced in1987It became an ISO standard in the year.

SQL is the most widely used database language and is supported by popular relational database systems (such as MySQL, SQL Server, and Oracle). However, certain features of the SQL standard are implemented in different ways in different database systems.

SQL was originally developed in197It was developed in the early 0s at IBM. Initially, it was called SEQUEL (Structured English Query Language), and later it was renamed to SQL (pronounced SQL).

What can SQL do

You can do more with SQL:

• You can create a database.

• You can create tables in the database.

• You can query or request information from the database.

• You can insert records into the database.

• You can update or modify records in the database.

• You can delete records from the database.

• You can set permissions or access specifications within the database to ensure data security.

• You can create views to avoid entering frequently used complex queries.

The list does not end here. You can use SQL to perform many other database-related tasks. In the following chapters, you will learn in detail about all these contents.

Each chapter example

Each chapter provides a simple SQL example.

SELECT　*　FROM TABLE_NAME;

This tutorial covers all the content.

This SQL tutorial series covers all the basic concepts of the SQL language, such as creating databases and tables, using constraints, adding records to tables, selecting records from tables based on different conditions, updating and deleting records in tables, and so on.

After becoming familiar with the basics, you will move on to the next level, which explains methods of retrieving records by connecting multiple tables and searching for records in tables based on patterns.

Finally, you will explore some advanced concepts such as modifying existing table structures, performing aggregations and grouping data together, creating views to simplify and protect table access, creating table indexes, handling dates and times, cloning existing tables, creating temporary tables, and the concepts of SQL subqueries and SQL injection.