windowfunctionSchema_4.sql

--Employees, Departments, Sales Tables
DROP TABLE IF EXISTS EMPLOYEES;

CREATE TABLE Employees (
    ID INT PRIMARY KEY,
    Name VARCHAR(100),
    Salary DECIMAL(10,2),
    DepartmentID INT
);

INSERT INTO Employees (ID, Name, Salary, DepartmentID)
VALUES (1, 'Alice', 35000, 1),
       (2, 'Bob', 40000, 2),
       (3, 'Carol', 55000, 3),
       (4, 'David', 60000, 2),
       (5, 'Ethan', 70000, 1);
       
---------------------------       
DROP TABLE IF EXISTS DEPARTMENTS;

CREATE TABLE Departments (
    ID INT PRIMARY KEY,
    Name VARCHAR(100)
);

INSERT INTO Departments (ID, Name)
VALUES (1, 'HR'),
       (2, 'Finance'),
       (3, 'Marketing');
       
----------------------------       
DROP TABLE IF EXISTS SALES;

CREATE TABLE Sales (
    EmployeeID INT,
    Product VARCHAR(100),
    Quantity INT
);

INSERT INTO Sales (EmployeeID, Product, Quantity)
VALUES (1, 'A', 10),
       (1, 'B', 5),
       (2, 'A', 7),
       (2, 'C', 3),
       (3, 'B', 8),
       (3, 'C', 2),
       (4, 'A', 9),
       (4, 'B', 6),
       (5, 'C', 4),
       (5, 'A', 3);