Added TCL Statements & Examples

Author: rahull0328

README.md

@@ -132,3 +132,83 @@ DELETE FROM employees WHERE age < 30;
 -- Delete all records
 DELETE FROM employees;
 ```
+### Transaction Control Language (TCL) 💾
+
+TCL statements are used to manage transactions in the database.
+
+#### COMMIT 💾
+
+Used to save the current transaction.
+
+```sql
+-- Commit the current transaction
+COMMIT;
+```
+
+#### ROLLBACK ⏪
+
+Used to undo transactions that have not yet been saved.
+
+```sql
+-- Rollback the current transaction
+ROLLBACK;
+```
+
+#### SAVEPOINT 📍
+
+Used to set a savepoint within a transaction.
+
+```sql
+-- Set a savepoint
+SAVEPOINT sp1;
+
+-- Rollback to the savepoint
+ROLLBACK TO SAVEPOINT sp1;
+```
+
+### Examples 📋
+
+#### Creating and Managing a Database 🛠️
+
+```sql
+-- Create a new database
+CREATE DATABASE company_db;
+
+-- Use the new database
+USE company_db;
+
+-- Create an employees table
+CREATE TABLE employees (
+    id INT PRIMARY KEY,
+    name VARCHAR(50),
+    age INT,
+    department VARCHAR(50)
+);
+
+-- Add a new column to the employees table
+ALTER TABLE employees ADD salary DECIMAL(10, 2);
+
+-- Insert records into the employees table
+INSERT INTO employees (id, name, age, department, salary) VALUES
+(1, 'John Doe', 30, 'HR', 60000),
+(2, 'Jane Smith', 25, 'Finance', 55000),
+(3, 'Mike Brown', 35, 'IT', 70000);
+
+-- Retrieve all employees
+SELECT * FROM employees;
+
+-- Update an employee's age
+UPDATE employees SET age = 31 WHERE id = 1;
+
+-- Delete specific employees
+DELETE FROM employees WHERE age < 30;
+
+-- Truncate the table
+TRUNCATE TABLE employees;
+
+-- Drop the table
+DROP TABLE employees;
+
+-- Drop the database
+DROP DATABASE company_db;
+```