├── README.md
├── Group By.sql
├── Sub Query.sql
├── My Databse.sql
└── inner Join.sql


/README.md:
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1 | # Database-Management-System
2 | 
3 | Databse Bsic code show here.
4 | 


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/Group By.sql:
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1 | SELECT department , SUM(salary) 
2 | FROM employee
3 | GROUP By department
4 | ORDER By SUM(salary) ASC;
5 | 


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/Sub Query.sql:
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 1 | SELECT name
 2 | FROM employee1
 3 | WHERE id = (SELECT id
 4 |   FROM employee2
 5 |   WHERE id = 5 );
 6 | 
 7 | 
 8 | 
 9 | 
10 | #Find Out the Value 
11 |   
12 | SELECT id 
13 | FROM employee2
14 | WHERE salary > (SELECT salary
15 |   FROM employee2
16 |   WHERE id = 2);
17 | 


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/My Databse.sql:
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 1 | CREATE DATABASE mydatabase ;         
 2 |  
 3 | 
 4 | 
 5 |  
 6 | 
 7 | 
 8 | CREATE TABLE users (
 9 |     id INT AUTO_INCREMENT PRIMARY KEY,
10 |     username VARCHAR(50) NOT NULL,
11 |     email VARCHAR(100) NOT NULL,
12 |     password VARCHAR(255) NOT NULL,
13 |     created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
14 | );
15 | 
16 | 
17 | 
18 | 
19 | 
20 | 
21 | 
22 | INSERT INTO users (username, email, password) 
23 | VALUES ('JohnDoe', 'john@example.com', 'password123'),
24 |        ('JaneDoe', 'jane@example.com', 'securepassword');
25 | 
26 | 


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/inner Join.sql:
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 1 |  -- Create Students Table
 2 | CREATE TABLE Students (
 3 |     StudentID INT PRIMARY KEY,
 4 |     Name VARCHAR(50),
 5 |     ClassID INT
 6 | );
 7 | 
 8 | -- Insert Sample Data into Students Table
 9 | INSERT INTO Students (StudentID, Name, ClassID)
10 | VALUES
11 | (1, 'Alice', 101),
12 | (2, 'Bob', 102), 
13 | (3, 'Charlie', 103),
14 | (4, 'Diana', 101);
15 | 
16 | -- Create Classes Table
17 | CREATE TABLE Classes (
18 |     ClassID INT PRIMARY KEY,
19 |     ClassName VARCHAR(50)
20 | );
21 | 
22 | -- Insert Sample Data into Classes Table
23 | INSERT INTO Classes (ClassID, ClassName)
24 | VALUES
25 | (101, 'Mathematics'),
26 | (102, 'Science'),
27 | (103, 'History');
28 | 
29 | -- Use INNER JOIN to Retrieve Data
30 | SELECT 
31 |     Students.StudentID,
32 |     Students.Name,
33 |     Classes.ClassName
34 | FROM 
35 |     Students
36 | INNER JOIN 
37 |     Classes
38 | ON 
39 |     Students.ClassID = Classes.ClassID;
40 | 


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