Aggregate
In lists, sets the summary function to Summarize. In crosstabs, sets the summary function to Automatic.
Automatic
Depending on the type of data item, applies the function None, Summarize, or Calculated based on the context in which the data item appears.
Calculated is applied if the data item expression:
- contains a summary function
- is an if-then-else or case expression that contains a reference to a measure
- contains a reference to a model calculation or to a measure that has the Regular Aggregate property set to a value other than Unsupported
- contains a reference to at least one data item that has the Rollup Aggregation Function property set to a value other than None
If the underlying data source is relational and if the data item expression contains no summary functions and a reference to at least one fact that has the Regular Aggregate property set to a value other than Unsupported, Summarize is applied.
In all other contexts, None is applied.
For relational and Dimensionally Modeled Relational (DMR) data sources, if this function is applied to a data item expression that has the average function, weighted averages are computed based on the lowest level detail values in the data source.
This is the default function.
Average
Adds all existing values and then divides by the count of existing values.
Calculated
Specifies that all the terms within the expression for a data item are aggregated according to their own rollup rules, and then the results of those aggregations are computed within the overall expression.
For example, a list contains the data item Quantity with the Aggregation property set to Total. You add a query calculation named Quantity Calculated. You define its expression as Quantity + 100 and you set its Aggregation property to Calculated. When you run the report, the values for Quantity Calculated are computed by first adding all values for Quantity and then adding 100 to each value.
In crosstabs, this function overrides any solve orders that are specified. For more information, see Multiple Calculations in Crosstabs and Charts.
Count
Counts all existing values.
Count Distinct
Returns the total number of unique non-null records.
Custom
Summarizes data based on an expression that you define.
Maximum
Selects the largest existing value.
Median
Returns the median value of the selected data item.
Minimum
Selects the smallest existing value.
None
Does not aggregate values.
If the underlying data source is relational, the data item is grouped when the query property Auto Group & Summarize is set to Yes. For more information, see Setting the Auto Group & Summarize Property.
Standard
Deviation
Returns the standard deviation of the selected data item.
From a mathematical perspective, this function is not useful for small numbers of items, and is not supported if the query property Auto Group & Summarize is set to Yes.
Summarize
Aggregates data based on model or data type information. This function can be thought of as a calculate and then aggregate rule. Data is aggregated using the following rules:
If the underlying data source type is relational and the data item or calculation is a reference to a single fact query item in the model that has the Regular Aggregate property set to Sum, Maximum, Minimum, Average, or Count, aggregate data using this function. Otherwise, data is aggregated according to the data type of the data item as follows:
- Total is applied for numeric and interval values.
- Maximum is applied for date, time, and date-time values.
- Count is applied for everything else.
The underlying data source type can be dimensional and the data item or calculation a reference to a single item in the model. In this case, if the Regular Aggregate property of the model item is not unknown, the summary function that corresponds to the Regular Aggregate property is applied. If the Regular Aggregate property is unknown, set the function to Calculated.
For example, a list contains the data item Quantity with the Aggregation property set to Average. You add a query calculation named Quantity Summarize. You define its expression as Quantity + 100 and you set its Aggregation property to Summarize. When you run the report, the values for Quantity Summarize are computed by first adding 100 to each value for Quantity and then calculating the total. The total is calculated because Quantity contains numeric values and the expression for Quantity Summarize is not a simple data item reference. If Quantity Summarize is defined as simply Quantity, the function Average is applied to each value.
Total
Adds all existing values.
Note: The Total function is valid for numeric fields. If used on non-numeric fields (Date fields for example) an error displays when you run the report.
Variance
Returns the variance of the selected data item.
Note: From a mathematical perspective, this function is not useful for small numbers of items, and is not supported if the query property Auto Group & Summarize is set to Yes.