Luutaa Technologies - Developer Blog

Remove duplicate rows from a mySQL db table

To remove the all the duplicate entries from a particular mysql table, use the below mysql query :

Step : 1

SELECT * FROM old_table WHERE 1 GROUP BY [COLUMN TO remove duplicates BY];

What the above query does is, it will create a new table with the filtered data (all duplicate entries were deleted).

Note : replace the whole  [COLUMN TO remove duplicates BY] with your column name

Step 2: After that delete the old table

DROP TABLE old_table;

Step 3 : rename the new table

RENAME TABLE new_table TO old_table;

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