Home Forums SQL Server 2008 SQL Server Newbies Delete duplicate records in a table RE: Delete duplicate records in a table

  • December 1, 2010 at 2:59 am

    #1257218

    chitturiii (12/1/2010)

    Hi,

    Can you please suggest me the best query to delete the duplicate records in a table with large number of records.

    Thanks in advance.

    --Chandra

    You may have to delete in batches if there are a very large number of rows to be deleted. Do you have a query which identifies the rows to delete? If not, post the structure of the table as CREATE TABLE etc and any indexes, also which columns are used to identify dupes.

    “Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.” - Gail Shaw

    For fast, accurate and documented assistance in answering your questions, please read this article.
    Understanding and using APPLY, (I) and (II) Paul White
    Hidden RBAR: Triangular Joins / The "Numbers" or "Tally" Table: What it is and how it replaces a loop Jeff Moden