🔥 How to Remove Duplicate Rows in SQL Using CTID | SQL Deduplication Tutorial скачать в хорошем качестве

🔥 How to Remove Duplicate Rows in SQL Using CTID | SQL Deduplication Tutorial

📌 Struggling with duplicate records in PostgreSQL? Learn how to identify and remove duplicates while keeping only one unique occurrence of each (customer_id, order_id) pair using CTID. 🔹 What You’ll Learn in This Video: ✅ How to find duplicate records in PostgreSQL ✅ How to use CTID for efficient row deletion ✅ How to keep only one unique occurrence of each record ✅ Best practices for handling duplicates 📌 Data Set Creation (SQL Code): CREATE TABLE orders ( customer_id INT, order_id INT ); INSERT INTO orders (customer_id, order_id) VALUES (101, 2001), (102, 2002), (103, 2003), (104, 2004), (105, 2005), (106, 2006), (107, 2007), (108, 2008), (109, 2009), (110, 2010), -- Duplicates (101, 2001), -- Duplicate 2 times (103, 2003), -- Duplicate 2 times (103, 2003), (105, 2005), -- Duplicate 3 times (105, 2005), (106, 2006), -- Duplicate 3 times (106, 2006), (107, 2007), -- Duplicate 4 times (107, 2007), (107, 2007) 💻 SQL Query Used in This Video: delete from orders where ctid in ( select ctid from ( select customer_id, order_id, row_number()over(partition by customer_id, order_id ) as rn, ctid from orders ) where rn 〉1 ) #PostgreSQL #SQL #DataCleaning #CTID #SQLTutorial #analytics #python 🚀