Forum Discussion
Table Merge creates duplicate records
The problem lay with the Data.
The LEFT JOIN functionality of PowerBI works perfectly.
Hi people.
I've been looking for this issue with no luck as well until I founded a valid work around.
the work around goes like this ::
-Merge your sheets as you like (you don't have to merge on more than one column, one is fine).
-Add index column
-Expand your merged column (this will create duplicate values, the main issue we're looking into).
-since the values in the "index column" were purely unique, now Remove duplicates using index column.
-and now your data is back to original as it was inteded to be.
I work with very extensive datas sheets and as soon as I tried this solution (that works pretty well) the uptade started to take hours to be conclude, thats the only issue Im having right now... Any clues about that?
Having the same issue. Performance severely degrades when I use this method. It works in theory, but in some cases will take forever.
hello there,
the slowness is not coming from adding an index column or removing the duplicate, Power BI and Excel Power Queries are always having a problem when using the "Merge" method, this is happening because "merge" includes a "reference" step inside of it, this specific step "reference" is a performance killer, it really slows everything down in a horrible way, the only two solutions I found to this problem is either you find a workaround to this and try to achieve your result without using "merge" or "reference" (a workaround that does the same effect and I have done that sometimes), the other solution is to not use it all together, there is really no way to optimize the "merge" itself.Regards,