How to delete duplicate rows in oracle without using rowid

Duplicate records in a database can lead to inefficiencies and incorrect query results.

Oracle SQL provides several efficient methods for identifying and removing these duplicates, ensuring data accuracy and integrity.

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This article explains step-by-step how to remove duplicates using the ROWID, a unique physical address for each row. This method ensures optimal performance and accuracy.

What is ROWID in Oracle?

In Oracle, ROWID is a unique identifier that specifies the physical location of a row in the database.

It is particularly useful for managing duplicate records because it allows us to distinguish between identical rows.

Steps to Delete Duplicate Records in Oracle SQL

Step 1: Create a Demo Table

Let’s first create a sample table to demonstrate the process of identifying and deleting duplicate records.

Query:

CREATE TABLE Demo (
PersonID INT,
LastName VARCHAR(255),
FirstName VARCHAR(255)
);

INSERT INTO Demo (PersonID, LastName, First

delete duplicates using rowid

delete duplicate rows in oracle using rowid