Remove duplicates using only a MySQL query?

Question

I have a table with the following columns:

URL_ID    
URL_ADDR    
URL_Time

I want to remove duplicates on the URL_ADDR column

Answer 1

Well, you could always:

1. create a temporary table;
2. INSERT INTO ... SELECT DISTINCT into the temp table from original table;
3. clear original table
4. INSERT INTO ... SELECT into the original table from the temp table
5. drop temp table.

It's clumsy and awkward, and requires several queries (not to mention privileges), but it will do the trick if you don't find another solution.