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Strategy to identify duplicates in an ETL context (for example)

/ Published in: PL/SQL
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This sql statement enables to detect duplicates entries over a key and creates a seq column which says which one is the sequence of the duplicates. This way you can take only the seq = 1 and still be able to identify all duplicates

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  1. SELECT fields, fields, ROW_NUMBER OVER (PARTITION primary key(s) ORDER BY...) seq
  2. FROM TABLE WHERE condition

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