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Delete duplicate records in MySQL database

/ Published in: MySQL
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Compare a table against itself to remove records where column value(s) are identical.

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  1. DELETE FROM table_name USING table_name, table_name AS vtable 
  2. WHERE (NOT table_name.id = vtable.id) 
  3. AND (table_name.column1 = vtable.column1) 
  4. AND (table_name.column2 = vtable.column2)

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