Mark duplicates in MySql with php (without deleting)
- by Adam
So, I'm having some problems with a MySQL query (see other question), and decided to try a different approach.
I have a database table with some duplicate rows, which I actually might need for future reference, so I don't want to remove. What I'm looking for is a way to display the data without those duplicates, but without removing them. I can't use a simple select query (as described in the other question).
So what I need to do is write a code that does the following:
1. Go through my db Table.
2. Spot duplicates in the "ip" column.
3. Mark the first instance of each duplicate with "0" (in a column named "duplicate") and the rest with "1".
This way I can later SELECT only the rows WHERE duplicate=0.
NOTE: If your solution is related to the SELECT query, please read this other question first - there's a reason I'm not just using GROUP BY / DISTINCT.
Thanks in advance.
