Home/ Questions/Q 148219
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-05-11T08:55:10+00:00

From a database backup I have records without unique Ids. Some records have unique

  • 0

From a database backup I have records without unique Ids.

Some records have unique IDs. Some records with duplicated IDs contains different DateCreated values. Some records with duplicated IDs contains the same DateCreated values.

I’m trying to get a MSSql 2005 query will leave only unique ID values with the most recent DateCreated value.

From 

ID|    DateCreated   1 |    1/1/09 2 |    1/2/09 2 |    2/2/09 3 |    1/3/09 3 |    1/3/09

To

ID|    DateCreated   1 |    1/1/09 2 |    2/2/09 3 |    1/3/09

Help

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. DELETE FROM myTable AS t1  WHERE EXISTS (     SELECT 1 FROM myTable AS t2      WHERE t1.ID=t2.ID AND t1.DateCreated<t2.DateCreated)

    ie, delete any row where there is another row with the same id and a later creation date.

    • 0