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    <p>Test this query </p> <pre><code>CREATE TEMPORARY table Kratika ( _id int, _value varchar(50) ); INSERT INTO Kratika SELECT 1, '1111222255' UNION SELECT 2, '1111222 255' UNION -- duplicate SELECT 3, '11112222 55' UNION -- duplicate SELECT 4, '1111222233'; -- not duplicate SELECT * FROM Kratika; DELETE FROM Kratika WHERE _value &lt;&gt; REPLACE(_value, ' ', '') ; SELECT * FROM Kratika; </code></pre> <p><strong>Output</strong></p> <pre><code>1 1111222255 2 1111222 255 3 11112222 55 4 1111222233 -- Select after deletion of duplicate records 1 1111222255 4 1111222233 </code></pre> <p><strong>Edited</strong></p> <p>If you are ok with while loop then you could test this (I am not a MySQL developer, I don't know why MySQL not allowing me to write while loop, so created proc for the same)</p> <pre><code>DROP PROCEDURE IF EXISTS test_kratik; delimiter ## CREATE PROCEDURE test_kratik ( ) BEGIN DROP table IF EXISTS Kratika; CREATE TEMPORARY table Kratika ( _id int, _value varchar(50) ); INSERT INTO Kratika SELECT 1, '1111222255' UNION SELECT 2, '1111222 255' UNION -- duplicate SELECT 3, '11112222 55' UNION -- duplicate SELECT 4, '1111222233'; -- not duplicate SELECT * FROM Kratika; SET @ID := 0; SET @DUP_ID := 0; SET @value := ''; WHILE @ID &lt;= (SELECT MAX(_id) FROM kratika) DO BEGIN IF EXISTS(SELECT _id from kratika WHERE _id = @ID) THEN BEGIN SET @value = (SELECT REPLACE(_value, ' ', '') from kratika WHERE _id = @ID); DELETE FROM kratika WHERE REPLACE(_value, ' ', '') = @value AND _id &lt;&gt; @ID; END; END IF; SET @ID = @ID + 1; END; END WHILE; UPDATE kratika SET _value = REPLACE(_value, ' ', '') WHERE _value &lt;&gt; REPLACE(_value, ' ', '') ; SELECT * FROM kratika; END ## delimiter ; CALL test_kratik(); </code></pre> <p><strong>Updated</strong> <em>It would be fine if you don't want to use while loop....</em></p> <pre><code> DROP TABLE IF EXISTS Kratika; CREATE TEMPORARY table Kratika ( _id int, _value varchar(50) ); INSERT INTO Kratika SELECT 1, '1111222255' UNION SELECT 2, '1111222 255' UNION -- duplicate SELECT 3, '11112222 55' UNION -- duplicate SELECT 4, '111122 2233'; -- not duplicate DROP TABLE IF EXISTS copy_temp; CREATE TEMPORARY table copy_temp ( _id1 int, _value1 varchar(50) ); INSERT INTO copy_temp SELECT _id, _value FROM kratika; SELECT * FROM Kratika; DELETE FROM Kratika WHERE _id &lt;&gt; (SELECT _id1 FROM copy_temp WHERE REPLACE(_value, ' ', '') = REPLACE(_value1, ' ', '') Limit 1 ); UPDATE kratika SET _value = REPLACE(_value, ' ', '') WHERE _value &lt;&gt; REPLACE(_value, ' ', '') ; SELECT * FROM Kratika; </code></pre> <p><strong>Output</strong></p> <pre><code>1 1111222255 2 1111222 255 3 11112222 55 4 1111222233 </code></pre> <p><strong>After Update</strong></p> <pre><code>1 1111222255 4 1111222233 </code></pre>
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    1. POMysql REPLACE and Delete old entry
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    1. COthis will delete all rows which get edited no mater if its duplicate or not .... ;(
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    2. CO@Harinder if 4th entry is `4 111122 2233`, then it will delete that also right. so you want to retain it with `1111222233` right?
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    3. COin place of 4th entry if u place 11112222 33 with space it will delete it because query will delete all thing with space
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