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What is SQL? Introduction to SQL (Structured Query Language)

SQL TUTORIALS-

What is SQL? Introduction to SQL (Structured Query Language)

Introduction-

What is SQL? Introduction to SQL-

-SQL (Structured Query Language) is a standard programming language used to manage and manipulate relational databases... SQL (Structured Query Language) is the standard language used to communicate with relational databases. It allows users to create, read, update, and delete (table) data efficiently. SQL is used by database administrators, developers, data analysts, and others to manage structured data stored in tables. A relational database stores data in rows and columns, and SQL helps in organizing, retrieving, and manipulating that data through commands like SELECT, INSERT, UPDATE, and DELETE...also SQL is its ability to perform complex queries using JOIN, GROUP BY, and subqueries. With SQL, users can filter data, perform calculations, and even create views and stored procedures.

-SQL is used with database systems like.

✅MySQL

✅PostgreSQL

✅Oracle

✅Microsoft SQL Server

✅SQLite

✅Why Learn SQL Language?

✅Data Management: Helps manage huge volumes of data.

✅Widely Used: Essential in data analysis, backend development, and database administration.

✅Career Opportunities: High demand in IT, data science, and software development fields.

✅ Basic SQL Commands:-

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SQL Commands

Command	Description	Example
SELECT	Retrieve data from a table	SELECT * FROM employees;
INSERT	Add new data to a table	INSERT INTO employees VALUES (...);
UPDATE	Modify existing data	UPDATE employees SET salary = 5000;
DELETE	Remove data from a table	DELETE FROM employees WHERE id=1;
CREATE	Create a new table or database	CREATE TABLE employees (...);
DROP	Delete a table or database	DROP TABLE employees;

🔑 Key Concepts of SQL:-

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Concept	Description
Table	A collection of related data organized in rows and columns
Row	A single record in a table
Column	A field in a table, defining the data type and name
Primary Key	A unique identifier for each row in a table
Foreign Key	A reference to the primary key in another table
Query	A command to retrieve specific data

Examples:- Select Data from a Table -Display:

SELECT name, age FROM employees WHERE department = 'Sales';

Examples:- Insert a New Record -Display:

INSERT INTO employees (name, age, department) VALUES ('John Doe', 30, 'Marketing');

Examples:- Update Existing Data -Display:

UPDATE employees SET age = 31 WHERE name = 'John Doe';

Basic SQL Example -Display:

-- Create a table 
CREATE TABLE employees (
  id INT,
  name VARCHAR(50),
  salary DECIMAL(10,2)
);

-- Insert data
INSERT INTO employees (id, name, salary) VALUES (1, 'pramod', 4500);

-- Select data
SELECT * FROM employees;

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