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https://issues.apache.org/jira/browse/SQOOP-832?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14056379#comment-14056379
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Jarek Jarcec Cecho commented on SQOOP-832:
------------------------------------------

Nice patch [~stanleyxu2005]! Might I suggest to mention something in the lines 
of:

{quote}
Please note that columns that are not included in the {{--columns}} parameter 
need to have either defined default value or allow {{NULL}} values. Otherwise 
your database will reject the imported data which in turn will make Sqoop job 
fail.
{quote}


> Document --columns argument usage in export tool
> ------------------------------------------------
>
>                 Key: SQOOP-832
>                 URL: https://issues.apache.org/jira/browse/SQOOP-832
>             Project: Sqoop
>          Issue Type: Bug
>          Components: docs
>            Reporter: Jarek Jarcec Cecho
>            Priority: Minor
>              Labels: newbie
>         Attachments: export-usage-patch.diff
>
>




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