Built-in Functions → rank
rank() is an analytic function that returns the rank of each row in a set of rows based on the order of the grouped values. Rows with identical values share the same rank and subsequent rows account for the number of previous rows. This results in nonconsecutive rank values. For instance, if three rows have an identical rank value of N, then the subsequent row has a rank value of N + 3.
The following table illustrates the behavior of the rank() analytic function:
|Category||Product||Min List Price||rank()|
Use the denseRank() function to return consecutive rank values.
rank(groupBy(Dimension,...), orderBy(aggregation_function(measure), true/false,...))
The following table illustrates the rank() function parameters:
|groupBy(Dimension,…)||Grouping function that specifies which group of data to operate over based on a dimension column, such as Product Category or Subcategory|
|orderBy()||Sorting function that specifies the order of rows based on an aggregation and a boolean value|
|aggregation_function(measure)||Aggregation function, such as min or max, that performs a calculation on a set of values for a measure, such as List Price or Cost, and returns a single value for each set|
|True||Enables an ascending order|
|False||Enables a descending order|
int representing the rank of each value in the column.
Find the rank of a product within a product category based on the minimum list price.
rank( groupBy(Prod_Category), orderBy( min(list_price), true ) )
Use the following steps for detailed instructions on how to use the rank() function to create the above query:
In the Cluster Management Console (CMC), you can create a tenant that includes Sample Data. The Sample Data includes the SALES schema.
- In the Navigation bar, select the Content tab, and then select + New → Add Dashboard.
- In the Add Dashboard dialog, for Name, enter Product Dashboard, and then select Add.
- In the Action bar, select + (add icon), or select + Add Insight.
- In the Insight panel, select Listing Table or V.
- In Tables, select Aggregated Table.
- In the Data panel, select Add Data Set (+).
- In the Manage Data Sets panel, in Tables, select SALES. Close the panel.
From the Data panel, drag and drop the following columns from the PRODUCTS table to the Grouping Dimension tray:
Drag and drop the List Price column from the PRODUCTS table to the Measure tray.
- If the Properties panel is not already open, select > to the right of the List Price pill to open the panel.
- In Format, select Dollar Rounded.
From the Data panel, drag and drop Add Formula to the Measure tray. The Formula Builder automatically opens:
- In Search Functions, select the down arrow, and then select Analytic Functions.
- Double-click the rank function,
rank(groupBy, orderBy), to add the formula to the editor.
In the Formula Editor,
- Replace dimension, … with Category from the Data panel
- Replace aggregation_function with min from the Functions panel
- Replace measure with List Price from the Data panel
- Replace true/false, … with true
- Select Validate & Save.
- In the Measure tray, double-click the New Formula pill and rename it to Rank (Min List Price).
- Name the insight Product List Price and Rank.
- In the Action bar, select Save.