Showing posts with label duplicate mysql rows. Show all posts
Showing posts with label duplicate mysql rows. Show all posts

Wednesday, July 23, 2008

How to find duplicate rows in mysql using php

There are times when you need to find duplicate rows or records in a mysql table.
This mostly happens when you import data sources from out side(CSV,EXCEL,SQL)
Following code will show you how to find duplicates,



select count(*) as num, ID, Name from table
group by ID,Name
having count(*) > 1



This code will group the given column and see if the grouped columns have more than one record

+-----+------+------------+
| num |ID | Name |
+-----+------+------------+
| 3 | 1 | Kuppiya |
+-----+------+------------+
| 2 | 3 | Apple |
+-----+------+------------+



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