Master SQL MERGE Statement | Best Real-Time Tutorial for Data Engineers & Analysts In Telugu
Learn the SQL MERGE statement from A to Z in this complete step-by-step tutorial!
In this video, you will understand what MERGE is, why it is used, and how to perform INSERT, UPDATE, and DELETE operations in a single SQL command.
-- Target (warehouse)
CREATE TABLE warehouse.Inventory ( SKU varchar(50) PRIMARY KEY, ProductName varchar(200), Qty int, Price decimal(10,2), LastUpdated datetime );
-- Source (daily snapshot)
CREATE TABLE staging.InventorySnapshot ( SKU varchar(50), ProductName varchar(200), Qty int, Price decimal(10,2) );
INSERT INTO warehouse.Inventory (SKU, ProductName, Qty, Price, LastUpdated)
VALUES
-- UPDATE Scenario (values outdated)
('SKU1001', 'Wireless Mouse', 50, 499.00, '2024-11-01'),
-- NO CHANGE Scenario
('SKU1002', 'USB Keyboard', 80, 799.00, '2024-11-01'),
-- DELETE Scenario (this row not present in source)
('SKU1003', 'HDMI Cable 1.5m', 120, 249.00, '2024-11-01'),
-- UPDATE Scenario (another mismatched product)
('SKU1004', 'Laptop Bag 15-inch', 30, 1299.00, '2024-11-01');
INSERT INTO staging.InventorySnapshot (SKU, ProductName, Qty, Price)
VALUES
-- UPDATE Scenario: Changed Qty & Price
('SKU1001', 'Wireless Mouse', 70, 479.00),
-- NO CHANGE Scenario
('SKU1002', 'USB Keyboard', 80, 799.00),
-- INSERT Scenario: New product present only in source
('SKU2001', 'Bluetooth Speaker', 40, 1499.00),
-- UPDATE Scenario: Name changed + Qty changed
('SKU1004', 'Laptop Bag 15-inch (New Model)', 25, 1399.00);
This tutorial includes:
✔ What is the SQL MERGE statement
✔ Syntax explained in simple language
✔ Real-time MERGE examples
✔ Upsert (Update + Insert) using MERGE
✔ Using WHEN MATCHED & WHEN NOT MATCHED
✔ MERGE vs INSERT/UPDATE
✔ Best practices for Data Engineers
✔ Real-time project scenarios (ETL/ELT/Data Warehousing)
This SQL MERGE tutorial is perfect for:
✔ Beginners
✔ SQL Developers
✔ Data Engineers
✔ BI Developers
✔ Students preparing for interviews
If you’re learning SQL for interviews or real-time projects, this is a must-watch video!
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