*Description of SQL (Structured Query Language)*
*SQL (Structured Query Language)* is a powerful, standardized programming language
used for managing and manipulating relational databases. It is the most widely used
language for interacting with databases, enabling users to perform a variety of tasks such as
querying, inserting, updating, and deleting data. SQL is essential for database
administrators, developers, analysts, and anyone working with structured data stored in
relational database management systems (RDBMS).
---
*Key Features of SQL:*
1. *Data Querying:*
- *SELECT*: SQL allows users to query databases and retrieve specific data from tables.
The `SELECT` statement is used to extract data based on certain conditions, making it one
of the most commonly used SQL commands.
Example:
```sql
SELECT name, age FROM employees WHERE department = 'HR';
```
2. *Data Manipulation:*
- SQL enables the *insertion*, *updating*, and *deletion* of data within the database.
These tasks are performed using the `INSERT`, `UPDATE`, and `DELETE` statements,
respectively.
Example:
```sql
INSERT INTO employees (name, age, department) VALUES ('John Doe', 30, 'HR');
UPDATE employees SET age = 31 WHERE name = 'John Doe';
DELETE FROM employees WHERE name = 'John Doe';
```
3. *Database Definition:*
- SQL provides commands for defining and managing the structure of databases and
tables. This includes creating tables, modifying schemas, and setting constraints (e.g.,
primary keys, foreign keys).
Example:
```sql
CREATE TABLE employees (
id INT PRIMARY KEY,
name VARCHAR(100),
age INT,
department VARCHAR(50)
*SQL (Structured Query Language)* is a powerful, standardized programming language
used for managing and manipulating relational databases. It is the most widely used
language for interacting with databases, enabling users to perform a variety of tasks such as
querying, inserting, updating, and deleting data. SQL is essential for database
administrators, developers, analysts, and anyone working with structured data stored in
relational database management systems (RDBMS).
---
*Key Features of SQL:*
1. *Data Querying:*
- *SELECT*: SQL allows users to query databases and retrieve specific data from tables.
The `SELECT` statement is used to extract data based on certain conditions, making it one
of the most commonly used SQL commands.
Example:
```sql
SELECT name, age FROM employees WHERE department = 'HR';
```
2. *Data Manipulation:*
- SQL enables the *insertion*, *updating*, and *deletion* of data within the database.
These tasks are performed using the `INSERT`, `UPDATE`, and `DELETE` statements,
respectively.
Example:
```sql
INSERT INTO employees (name, age, department) VALUES ('John Doe', 30, 'HR');
UPDATE employees SET age = 31 WHERE name = 'John Doe';
DELETE FROM employees WHERE name = 'John Doe';
```
3. *Database Definition:*
- SQL provides commands for defining and managing the structure of databases and
tables. This includes creating tables, modifying schemas, and setting constraints (e.g.,
primary keys, foreign keys).
Example:
```sql
CREATE TABLE employees (
id INT PRIMARY KEY,
name VARCHAR(100),
age INT,
department VARCHAR(50)
