Registered users of this product or Trifacta Wrangler Enterprise should login to Product Docs through the application.
aggregate transform performs summary calculations across a set of values in a column, as grouped by the values in another column.For example, you can compute the average and standard deviation of test scores by student, by gender, by class room number, or by all of those groups.
- In this case, all other data in the dataset is removed. You can add additional columns as part of the
- For more information on available functions, see Aggregate Functions.
Basic UsageOutput: Reshapes the dataset to two columns: The new
Regioncolumn contains the unique values from the source
Regioncolumn, and the
max_totalSalescolumn contains the maximum value of the values in the original
totalSalescolumn for each value in
|Parameter||Required?||Transform Builder||Data Type||Description|
Expression that evaluates to the aggregate function call and its parameters
See Aggregate Functions.
|group||N||Group by||string||Column name or names containing the values by which to group for calculation|
For more information on syntax standards, see Language Documentation Syntax Notes.
aggregate transform, the
value parameter contains the function call and its parameters, which define the set of columns to which the function is applied.
NOTE: For the
value parameter, you can only use aggregate functions. For more information, see Aggregate Functions .
|Yes||String (expression that evaluates to a value using the referenced aggregate function)|
aggregate transform, this parameter specifies the column or columns whose values are used to group the dataset prior to applying the specified function. You can specify multiple column names as comma-separated values.
group parameter is applied, the transform is applied across the entire dataset.
NOTE: Be careful applying this transform across groups containing a large number of unique rows. In some cases, the application can run out of memory generating the results, and your results can fail.
|No||String (column name)|
See the individual functions for examples. See Aggregate Functions.
This page has no comments.