Categories: Window

ROW_NUMBER

Returns the row number for the current row based on the ORDER BY clause within each partition. Rows containing identical values receive different row numbers.

Syntax

ROW_NUMBER() 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",
  ROW_NUMBER() 
    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, Friday, 2

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.