Home/ Questions/Q 6068647
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-05-23T09:44:15+00:00

What i have is two columns specialid and date in tblSpecialTable, my table has

  • 0

What i have is two columns specialid and date in tblSpecialTable, my table has duplicate specialID’s, i want to delete from the table where date column is the older date and where specialid’s are duplicated.

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    See my example:

    mysql> SELECT * FROM test;
+------+---------------------+
| id   | d                   |
+------+---------------------+
|    1 | 2011-06-29 10:48:41 | 
|    2 | 2011-06-29 10:48:44 | 
|    3 | 2011-06-29 10:48:46 | 
|    1 | 2011-06-29 10:48:52 | 
|    2 | 2011-06-29 10:48:53 | 
|    3 | 2011-06-29 10:48:55 | 
+------+---------------------+
mysql> DELETE t1 FROM test t1 INNER JOIN test t2 ON t1.id = t2.id AND t1.d < t2.d;
Query OK, 3 rows affected (0.00 sec)
mysql> SELECT * FROM test;
+------+---------------------+
| id   | d                   |
+------+---------------------+
|    1 | 2011-06-29 10:48:52 | 
|    2 | 2011-06-29 10:48:53 | 
|    3 | 2011-06-29 10:48:55 | 
+------+---------------------+

    See also http://dev.mysql.com/doc/refman/5.0/en/delete.html

    • 0