Home Discussion Discuss: Mysql Find Duplicate Records

  • Good queryNeomaster November 29, 2011 at 2:25 AM

    This is good query and for more detail use following example: -- -- Table structure for table `employee` -- CREATE TABLE IF NOT EXISTS `employee` ( `id` int(11) DEFAULT NULL, `first_name` varchar(15) DEFAULT NULL, `last_name` varchar(15) DEFAULT NULL, `start_date` date DEFAULT NULL, `end_date` date DEFAULT NULL, `salary` float(8,2) DEFAULT NULL, `city` varchar(10) DEFAULT NULL, `description` varchar(15) DEFAULT NULL ) ENGINE=InnoDB DEFAULT CHARSET=latin1; -- -- Dumping data for table `employee` -- INSERT INTO `employee` (`id`, `first_name`, `last_name`, `start_date`, `end_date`, `salary`, `city`, `description`) VALUES (1, 'Jason', 'Martin', '1996-07-25', '2006-07-25', 1234.56, 'Toronto', 'Programmer'), (2, 'Alison', 'Mathews', '1976-03-21', '1986-02-21', 6661.78, 'Vancouver', 'Tester'), (3, 'James', 'Smith', '1978-12-12', '1990-03-15', 6544.78, 'Vancouver', 'Tester'), (4, 'Celia', 'Rice', '1982-10-24', '1999-04-21', 2344.78, 'Vancouver', 'Manager'), (5, 'Robert', 'Black', '1984-01-15', '1998-08-08', 2334.78, 'Vancouver', 'Tester'), (6, 'Linda', 'Green', '1987-07-30', '1996-01-04', 4322.78, 'New York', 'Tester'), (7, 'David', 'Larry', '1990-12-31', '1998-02-12', 7897.78, 'New York', 'Manager'), (8, 'James', 'Cat', '1996-09-17', '2002-04-15', 1232.78, 'Vancouver', 'Tester'), (NULL, 'James', 'Cat', '2011-11-29', '2011-11-30', 30000.00, 'New Yark', 'no desc'), (NULL, 'David', 'Larry', '2011-11-01', '2011-11-30', 50000.00, 'New Yark', 'no desc'); -- -- Get duplicate from table `employee` -- SELECT * , count( * ) AS Iteration FROM employee GROUP BY first_name HAVING Iteration > 1 LIMIT 0 , 30

  • Removing Duplicate RecordsVimal Raj January 18, 2012 at 1:39 PM

    This query is quite useful to find the duplicate records. But i need the query to delete those duplicate records. Can anyone help me out ??

  • Feedbackabrightworker January 23, 2012 at 4:44 PM

    Nice example

  • Need help to find duplicate recordPrashant March 29, 2012 at 6:07 PM

    Hi, I want to find the duplicate records from a row. I know group by clause is there, but I want to filter the records depending on some other conditions. I want to use where condition also. Please help me.

  • Good postsoft July 12, 2012 at 1:35 AM

    My peoblem id solved thanks

  • Duplicate RecordsImmanuel November 16, 2012 at 3:00 PM

    Is there a way I can view the records without grouping them? selecting only the repeated ones?

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