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Syndicate_Admin
Administrator
Administrator

Get Data from a Nested Table

Hello, 
within my data table I have several nested tables.
Using if conditions I want to check for different scenarios.
E.g. if [value_column] > [value_nestedtable1] then 1 else 0

I'm accessing the data within the nested table by using List.Max([nested_table][column_in_nestedtable]).
That works, however, it slows down my report significantly. 
The data within the nested tables are either numbers or dates.
Is there a better way to access the data within a nested table?


Thanks in advance,
Marco

3 REPLIES 3
Anonymous
Not applicable

Do your nested tables result from a join, group, or something else.  Of course, if it's from grouping, you can add the Max aggregate in your group step.

 

--Nate

Syndicate_Admin
Administrator
Administrator

Thank you for the answer.
I think in that way I aggregate the nested table and only retrieve one value.
Actually, I want to keep the whole nested table as I need it for further calculations.
Then I have the same issue that getting data out of the nested tables slows down my report. 

Anonymous
Not applicable

You could instead use 

 

Table.AggregateTableColumn(table as table, column as text, aggregations as list) as table

and then do your comparison. So

 

= Table.AggregateTableColumn(TableOrPriorStepName, {{"ColumnInNestedTable", List.Max, "NewColumnName"}})


A lot of these table functions are very well optimized.

 

--Nate

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