How To Dupe Duplicate Rows In Three Easy Steps

July 08, 2010

How To Dupe Duplicate Rows In Three Easy Steps

By Michael Marr

Repetitive information goes against good database design, and thus is reason enough to find and remove duplicate values. However, when utilizing an UNIQUE key or other types of indexes, duplications actually break or prevent statements from executing properly.

Step 1: Determine if duplicates exist.

mysql>SELECT value, count(*) as num
FROM t1
GROUP BY value
HAVING count(*) > 1;

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