sql server - delete duplicate rows -

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Anyone know how to remove duplicate rows by writing a new way from the script below to improve the functionality. 

  DELETE lt1 FROM #listingsTemp lt1, #listingsTemp lt2 WHERE lt1.code = lt2.code and lt1.classification_id & gt; Lt2.classification_id and (lt1.fap

: 

  Delete table_a where the row is not (Select the minimum (line) from Table_A group by Table 2, column 2);

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