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Don Burleson Blog 







Delete multiple duplicate rows

Oracle Database Tips by Donald BurlesonFebruary 8, 2015

I have a table with rows duplicated 3 and 4 times each.  How can I remove all of the duplicate rows and only leave one unique row in the table?


Answer:  Deleting multiple duplicate rows is quite easy in Oracle SQL.
Also see these notes on delete duplicate rows examples.
If you have a table with multiple duplicate rows, there are several ways to remove all of the duplicate rows, thereby making each row unique:
   1:  Use CTAS:  You can use "create table as select" using a distinct clause.
   2:  Join the table to itself, using the MIN clause.  This will remove multiple duplicate rows.

   3:  Use a subquery to delete multiple duplicate rows. 

   4. Use the RANK and partition clause where rank > 1 to remove all duplicates.


   5: Use analytic function to remove all duplicate rows. 


Again, please see these examples on delete duplicate rows.

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