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Symptoms

Assume that you execute a query to select data from an Oracle linked server by using a merge join in Microsoft SQL Server 2012 or SQL Server 2014. When there is a NUMBER type column that does not have a defined precision in the Oracle linked server, the query executes successfully, but some rows are missing in the result.

Note This issue only occurs if the merge join is automatically selected by SQL Server.

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Workaround

To work around this issue, use a nested loops join or a hash join by using the Option command instead of the merge join.

Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.

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