PBI RS January 2019 - Power Query Editor "Group By" Fails on Oracle Source

Status: New
by ferzfeld Frequent Visitor on ‎01-29-2019 02:07 AM

Hello all,


with the new January 2019 release it is not possible to apply the "Group by" step to your Oracle data source anymore (see screenshots). Problem can be reproduced on different servers, databases, tables and computers.


This is a massive show stopper for us as we have many users using Oracle as a source in Power BI.


Can you please look into this issue? Thank you! :-)


2019-01-29_10h54_52.pngSelect Group by on a column in PQE2019-01-29_10h56_03.pngClick OK2019-01-29_10h56_17.pngAlways receive this error, tested it on different servers and databases

by 7700 Frequent Visitor
on ‎01-29-2019 05:15 AM

Hi ferzfeld, have you tested your query on SQL developer? The error shown is not PowerBI but Oracle and happens when an aggregate measure is used with no GROUP BY clause.

by ferzfeld Frequent Visitor
on ‎01-29-2019 05:31 AM

Hi 7700,


Thank you for your reply.


  • No query is used, the following steps have been taken for this example:
    • Get Data -> Oracle Source
    • Select the Plant-Dimension table from the oracle schema
    • Edit --> Power Query Editor
    • Right click on the column, select "Group By", click OK
    • Generated SQL Statement by PQE sent to Oracle DB is faulty and causes Error
  • The exact SAME steps performed on the August 2018 PBI RS Desktop will work just fine


Luckily - reports that are created with the August 2018 release and published to the January 2019 Report Server will still refresh. The bug lies in Power BI Desktop January 2019. 


Actually we have Microsoft consultants in our enterprise at the moment and they were able to reproduce this issue as well.


By the way - the same steps on a Microsoft SQL Server work fine, only Oracle DB connection seems to have this problem.


Looking forward from a feedback from Microsoft about this :-)

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