Categories: Window

RANK

Returns the rank of the current row within its partition and placement order. Rows that are equal have the same rank. However, the count of tied rows is added to the next rank, instead of being incremented by one. The rank value starts at 1 and increases sequentially.

Syntax

RANK() OVER ( [PARTITION BY partition_expression] [ORDER BY order_expression]) → bigint

• partition_expression: An optional expression that groups rows into partitions.
• order_expression: An optional expression that specifies the order of the rows within each partition.

Examples

SELECT "Category", 
  "Descript", 
  "DayOfWeek",
  RANK() 
    OVER (
      PARTITION BY "Category" 
      ORDER BY "DayOfWeek")
FROM Samples."samples.dremio.com"."SF_incidents2016.json"

-- Category, Descript, DayOfWeek, EXPR$3
-- ARSON, ARSON, Friday, 1 
-- ARSON, ARSON, Monday, 40

Usage Notes

The example uses Dremio’s Samples Data Lake, which includes sample datasets that you can practice with. You must manually add this data lake. To add in Dremio Cloud, see Add Dremio’s Samples Data Lake to Your Project. Guidance to add in Dremio Software is in development.