Troubleshoot Data Blending in Tableau Part 1( Unsupported Agg.& Asterisks errors)
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Cannot blend the secondary data source because one or more fields use an unsupported aggregation
Data blending has some limitations regarding non-additive aggregates such as COUNTD, MEDIAN, and RAWSQLAGG. Non-additive aggregates are aggregate functions that produce results that cannot be aggregated along a dimension. Instead, the values have to be calculated individually. All Number functions, except for MAX and MIN, are non-additive aggregates. For more information, see Tableau Functions (by Category).
These limitations cause certain fields in the view to become invalid under certain circumstances. If you hover your mouse cursor over one of these invalid fields, you see the following error:
Cannot blend the secondary data source because one or more fields use an unsupported aggregation.