SQL

---

SQL stands for “Structured Query Language.” It is a domain-specific language used for managing and manipulating relational databases. SQL provides a standardized way to communicate with databases, allowing users to perform various operations such as querying data, inserting, updating, and deleting records, creating and modifying database schemas, and more.

SQL is used by developers, database administrators, and data analysts to interact with databases. Here are some common categories of SQL statements:

1. Data Query Language (DQL): Used to retrieve data from one or more tables. The most common DQL statement is the SELECT statement.
2. Data Manipulation Language (DML): Used to manipulate data stored in a database. This includes statements like INSERT, UPDATE, DELETE, and MERGE.
3. Data Definition Language (DDL): Used to define and manage the structure of the database objects such as tables, indexes, and views. This includes statements like CREATE, ALTER, and DROP.
4. Data Control Language (DCL): Used to manage the permissions and security of the database. This includes statements like GRANT and REVOKE.
5. Transaction Control Language (TCL): Used to manage transactions within the database. This includes statements like COMMIT, ROLLBACK, and SAVEPOINT.

Here are a few examples of SQL statements:

1. Query to retrieve all employees from the “employees” table:

   SELECT * FROM employees;

2. Insert a new employee record into the “employees” table:

   INSERT INTO employees (first_name, last_name, department_id) VALUES ('John', 'Doe', 3);

3. Update an employee’s salary:

   UPDATE employees SET salary = 60000 WHERE employee_id = 101;

4. Delete an employee from the “employees” table:

   DELETE FROM employees WHERE employee_id = 102;

SQL is a powerful tool for managing and working with relational databases, and it is widely used in various applications and industries to handle data efficiently and effectively.

---

SQL is an incredibly powerful and versatile language that can be used to unlock a wealth of information from data sources. It allows users to access, manipulate, and analyze large amounts of data quickly and efficiently. With SQL’s ability to store complex queries in the form of stored procedures, it makes it easy for developers to reuse code without needing to rewrite them every time they need similar results. Additionally, its simple syntax structure makes writing SQL statements much easier than other programming languages such as Java or C++. Therefore, if you are looking for a reliable way of managing your databases then SQL should definitely be at the top of your list!

References:

SQL (Structured Query Language) is a domain-specific language used in programming and designed for managing data held in a relational database management system (RDBMS). It is used to query [1][2], insert, update, delete, and manage data stored in a relational database. SQL statements can be used to perform a wide variety of tasks, including retrieving and manipulating data, creating and managing database objects, and controlling user access to the database. SQL is an essential tool for working with relational databases, and it is widely used in web applications, data warehouses, and data science projects.

1. SQL – Wikipedia
   https://en.wikipedia.org/wiki/SQL
2. Microsoft SQL Server – Wikipedia
   https://en.wikipedia.org/wiki/Microsoft_SQL_Server

SQL Code Example:

use Ctrl + f7 shortcut to format