update-mode in sqoop - Wikitechy https://www.wikitechy.com/interview-questions/tag/update-mode-in-sqoop/ Interview Questions Wed, 08 Sep 2021 09:36:36 +0000 en-US hourly 1 https://wordpress.org/?v=6.9.4 https://www.wikitechy.com/interview-questions/wp-content/uploads/2025/10/cropped-wikitechy-icon-32x32.png update-mode in sqoop - Wikitechy https://www.wikitechy.com/interview-questions/tag/update-mode-in-sqoop/ 32 32 What is update command in sqoop ? https://www.wikitechy.com/interview-questions/sqoop/what-is-update-command-in-sqoop/ https://www.wikitechy.com/interview-questions/sqoop/what-is-update-command-in-sqoop/#respond Thu, 22 Jul 2021 06:52:07 +0000 https://www.wikitechy.com/interview-questions/?p=1200

Update command in sqoop:

  • There are two approaches to update in sqoop.
    • The records inserted are to be added to the target table.
    • The sqoop provides an update mode by providing “update-key <column(s)>” command.
  • This command is used to generate the SQl update statement.
  • If the value in column 1 matches the data is updated else the data is inserted into the table.
  • This technique is also refered to as upsert where the default action is update but insertion takes place when matching data is not available.
$ sqoop export (Generic Arguments)
  --table target-relational-table 
  --update-key column1
  --export-dir /user/my-hdfs-file
  ...
Generates => UPDATE target-relational-table SET
                    column2=1000,column3=2000
		          WHERE column1=100;
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