Introduction to SQL

SQL (Structured Query Language) is a standard programming language specifically designed for managing and manipulating relational databases. SQL is used to perform tasks such as querying data, updating records, and managing database schemas.

Key Features of SQL

SQL provides a range of functionalities for interacting with relational databases. Some key features include:

• Data Querying: SQL allows you to retrieve specific data from a database using queries. The SELECT statement is commonly used for this purpose.
• Data Manipulation: SQL provides commands for inserting, updating, and deleting data. These include INSERT, UPDATE, and DELETE statements.
• Data Definition: SQL allows you to define and manage the structure of database objects like tables, indexes, and views using statements such as CREATE, ALTER, and DROP.
• Data Control: SQL provides mechanisms for controlling access to the data through permissions and user roles.

Basic SQL Syntax

SQL statements are typically written in uppercase and follow a specific syntax. Here are some basic examples:

• SELECT: Used to query data from a table.
  SELECT column1, column2 FROM table_name;
• INSERT INTO: Used to insert new records into a table.
  INSERT INTO table_name (column1, column2) VALUES (value1, value2);
• UPDATE: Used to modify existing records.
  UPDATE table_name SET column1 = value1 WHERE condition;
• DELETE: Used to delete records from a table.
  DELETE FROM table_name WHERE condition;

SQL is a powerful tool for database management, and learning it can greatly enhance your ability to work with data effectively.