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Topic Review (Newest First)

  • July 25th, 10:14 AM
    deltaforce

    Remove Duplicate Rows in MySQL Table Having No Primary Key or Unique Index

    I have a table item having just one column name:-

    name
    -----
    toys
    shirt
    mobile
    Shirt
    speaker
    Toys
    ....
    ....

    I am trying to delete duplicate rows except one duplicated record with the help of below query

    DELETE FROM ( SELECT `name`,`rownumber` FROM (SELECT GREATEST(0,num := IF(`name` = NAME, num + 1, 1),LEAST(1, LENGTH(NAME := `name`))) AS rownumber,`name` FROM item ORDER BY `name`) AS result1 ) AS result WHERE rownumber >1

    The Inner query (Starts from SELECT name and ends with result1) returns individual auto incremented number for each repeating group but when i run entire query then it does not work.

    I would like to know what changes i need to make in the inner query (contained in round braces) to delete duplicate rows.

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