🚀 Master SQL for Interviews! 📊

💡 SQL Challenge: Ready to test your skills? Here’s a commonly asked SQL Interview Question that you must know to ace your next job interview! 👇

🔥 Question:
Write a SQL query to calculate the cumulative sum of sales for each employee. The result should include:
👉 EmployeeID
👉 SaleDate
👉 CumulativeSales



--SQL Code to Create the Table:

CREATE TABLE Sales (
EmployeeID INT,
SaleDate DATE,
SaleAmount DECIMAL(10, 2)
);


--Insert Sample Data into the Table

INSERT INTO Sales (EmployeeID, SaleDate, SaleAmount) VALUES
(1, '2024-01-01', 100.00), -- Employee 1 made a sale of 100 on Jan 1
(1, '2024-01-02', 150.00), -- Employee 1 made another sale on Jan 2
(1, '2024-01-03', 200.00), -- Employee 1 made another sale on Jan 3
(2, '2024-01-01', 120.00), -- Employee 2 made a sale on Jan 1
(2, '2024-01-02', 180.00), -- Employee 2 made another sale on Jan 2
(3, '2024-01-01', 200.00), -- Employee 3 made a sale on Jan 1
(3, '2024-01-03', 100.00), -- Employee 3 made a sale on Jan 3
(3, '2024-01-04', 50.00); -- Employee 3 made another sale on Jan 4

✨ Here’s the SQL Query Solution:
WITH CumulativeSales AS (
SELECT
EmployeeID,
SaleDate,
SaleAmount,
(SELECT SUM(SaleAmount)
FROM Sales AS S2
WHERE S2.EmployeeID = S1.EmployeeID
AND S2.SaleDate <= S1.SaleDate) AS CumulativeSales
FROM Sales S1
)
SELECT
EmployeeID,
SaleDate,
SaleAmount,
CumulativeSales
FROM CumulativeSales
ORDER BY EmployeeID, SaleDate;

📌 For a detailed explanation and additional learning, watch my YouTube video: 🎥
https://youtu.be/baWTD9S0dpY

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🚀 Just uploaded a must-watch video on YouTube:
"SQL Interview Question: Calculate Cumulative Sum of Sales for Employees"


🔍 Learn step-by-step how to calculate the cumulative sum of sales for each employee. This tutorial is perfect for:
✅ SQL beginners
✅ Job seekers preparing for technical interviews
✅ Anyone looking to enhance their database skills

🎥 Watch the video now: https://youtu.be/baWTD9S0dpY

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