SQL - Structured Query Language

SQL (Structured Query Language) is a programming language used to communicate and interact with relational databases. It provides a standardized way to manage, manipulate, and query data stored in a database.

Features of SQL

SQL offers several features that make it a powerful tool for working with databases:

• Data Retrieval: SQL allows you to retrieve specific data from one or more tables using queries.
• Data Manipulation: SQL provides commands to insert, update, and delete data in a database.
• Data Definition: SQL enables you to define the structure of a database, including tables, columns, and relationships.
• Data Control: SQL allows you to enforce data constraints, permissions, and access control.

Basic SQL Syntax

SQL statements are written using a specific syntax. Here's an example of a simple SQL query that retrieves all rows from a table:

1SELECT * FROM table_name;

In this example, SELECT is the keyword used to retrieve data, * is a wildcard character representing all columns, and table_name is the name of the table.

Example SQL Query

Here's an example SQL query that retrieves the names of all customers from a customers table:

1SELECT name FROM customers;

This query retrieves the name column from the customers table.

SQL is a powerful language that allows you to perform complex operations on databases. By learning SQL, you can effectively interact with relational databases and manipulate data to meet your application requirements.

Now, it's time for you to practice using SQL with relational databases. Use the code editor below to write SQL statements and execute them:

1-- Replace with your SQL code
2/* Write your SQL statements here */

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/* Replace with relevant SQL code */