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SQL for Deleting all duplicate entries

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Hi,

I want to create a DELETE statement which deletes duplicates 
in a table.

That is, I want to remove all rows - but one - having three 
columns with the same data (more columns exist and there the 
data varies).
For example:
column1
column2
column3
column4
column5

column2 = 'test', column3 = 'hey' and column4 IS NULL for 
several rows in the table. I want to keep just one of those 
rows.

Is this possible? I can't figure it out, so any help MUCH 
appreciated!

/regards, Håkan Jacobsson - System developer at Relevant 
Traffic, Sweden

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TIP 6: explain analyze is your friend


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