devxlogo

Delete Duplicate Rows From an Oracle Table

Why Trust Us

It’s easy to introduce duplicate rows of data into Oracle tables by running a data load twice without the primary key or unique indexes created or enabled.

Here’s how you remove the duplicate rows before the primary key or unique indexes can be created:

 DELETE FROM our_tableWHERE rowid not in(SELECT MIN(rowid)FROM our_tableGROUP BY column1, column2, column3... ;

Here column1, column2, column3 constitute the identifying key for each record.
Be sure to replace our_table with the table name from which you want to remove the duplicate rows. The GROUP BY is used on the columns that make the primary key for the table. This script deletes each row in the group after the first row.

Charlie has over a decade of experience in website administration and technology management. As the site admin, he oversees all technical aspects of running a high-traffic online platform, ensuring optimal performance, security, and user experience.

See also  Seven Service Boundary Mistakes That Create Technical Debt
Disclosure

About Our Editorial Process

At DevX, we’re dedicated to tech entrepreneurship. Our team closely follows industry shifts, new products, AI breakthroughs, technology trends, and funding announcements. Articles undergo thorough editing to ensure accuracy and clarity, reflecting DevX’s style and supporting entrepreneurs in the tech sphere.

See our full editorial policy.

Show More