Feb 10, 2009 · You should do a small pl/sql block using a cursor for loop and delete the rows you don't want to keep. For instance: declare prev_var my_table.var1%TYPE; begin for t in (select var1 from my_table order by var 1) LOOP -- if previous var equal current var, delete the row, else keep on going. end loop; end;

This tutorial shows you step by step how to delete duplicate records in Oracle Database using DELETE statement with a subquery.

Jan 29, 2016 · An explanation of how to find rows with duplicate values in a table using SQL. And delete them. Finishes by showing how to stop people entering new duplicates!

What's the simplest SQL statement that will return the duplicate values for a given column and the count of their occurrences in an Oracle database table? For example: I have a JOBS table with the column JOB_NUMBER. How can I find out if I have any duplicate JOB_NUMBERs, and how many times they're duplicated?

Dec 2, 2024 · Oracle SQL provides several efficient methods for identifying and removing these duplicates, ensuring data accuracy and integrity. This article explains step-by-step how to remove duplicates using the ROWID , a unique physical address for each row.

Feb 18, 2025 · How to delete duplicate rows from Oracle. Here are some of the ways to delete duplicate rows in an easy manner (A) Fast method but you need to recreate all oracle indexes, triggers

In this article, we explored four different ways to delete duplicate records in an Oracle database: using RowID-based deletion, self-join technique, temporary tables with the DISTINCT keyword, and leveraging Oracle’s analytic functions.

The following options can be used to delete duplicate rows in Oracle Database. These examples delete duplicate rows but keep one. So if there are three identical rows for example, it deletes two of them and keeps one.

Jun 1, 2015 · you can delete duplicate data by using following sql query: delete from [table_name] where rowid in ( select max(rowid) from [table_name] group by [column_name] ); Note: [table_name] like STUDENT and [column_name] like STUD_ID

Nov 11, 2024 · In PL/SQL, duplicate rows are removed by finding and eliminating rows with the same values in a subset of columns. Utilizing the ROWID pseudo-column to uniquely identify rows is one method of doing this. The main procedure entails eliminating rows with duplicate ROWIDs after choosing unique rows based on predetermined columns.