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How to remove duplicate rows in SQL Server 2005 when no key is present

, 20 Dec 2012 CPOL
This tip describes how to delete duplicate rows from a table that doesn't have a key.

Alternatives

Members may post updates or alternatives to this current article in order to show different approaches or add new features.

22 Feb 2011
Costica U
Here is another solution:IF OBJECT_ID( 'tempdb..#TestTable' ) IS NOT NULL BEGIN DROP TABLE #TestTable ENDCREATE TABLE #TestTable ( Column1 varchar(1), Column2 int )INSERT INTO #TestTable VALUES ('A', 1);INSERT INTO #TestTable VALUES ('A', 1); --...

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About the Author

Mika Wendelius
Architect
Finland Finland
I've been a programmer since mid 80's using languages like assembler, C/C++, PL/I (mainframe environment), pascal, VB (I know, I know, no comments please) and C# and utilizing different techniques and tools.
 
However I'm specialized in databases and database modeling. Mostly I have used products like Oracle (from version 6), SQL Server (from version 4.2), DB2 and Solid Server (nowadays an IBM product).
 
For the past 10+ years my main concerns have been dealing with different business processes and how to create software to implement and improve them. At my spare time (what ever that actually means) I'm also teaching and consulting on different areas of database management, development and database oriented software design.

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