ROWNUMBER Function

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Generates a new column containing the row number as sorted by the order parameter and optionally grouped by the group parameter.

Tip: To generate row identifiers by the original order in the source data, use SOURCEROWNUMBER. See SOURCEROWNUMBER Function.

This function works with the following transforms:

Basic Usage

Example:

window ROWNUMBER() order:Date

Output: Generates the new column, which contains the row number of each row as ordered by the values in the Date column.

Example with grouping:

window ROWNUMBER() order:Date group:QTR

Output: Generates the new column , which contains the row number of each row as ordered by the values in the Date column grouped by the QTR values. For each quarter value, the row number counter resets.

Syntax and Arguments

window value:ROWNUMBER() order: order_col [group: group_col]

For more information on the order and group parameters, see Window Transform.

For more information on syntax standards, see Language Documentation Syntax Notes.

Examples

Tip: For additional examples, see Common Tasks.

Example - Rolling window functions

This example describes how to use the rolling computational functions:

ROLLINGSUM - computes a rolling sum from a window of rows before and after the current row. See ROLLINGSUM Function.
ROLLINGAVERAGE - computes a rolling average from a window of rows before and after the current row. See ROLLINGAVERAGE Function.
ROWNUMBER - computes the row number for each row, as determined by the ordering column. See ROWNUMBER Function.

The following dataset contains sales data over the final quarter of the year.

Source:

Date	Sales
10/2/16	200
10/9/16	500
10/16/16	350
10/23/16	400
10/30/16	190
11/6/16	550
11/13/16	610
11/20/16	480
11/27/16	660
12/4/16	690
12/11/16	810
12/18/16	950
12/25/16	1020
1/1/17	680

Transform:

First, you want to maintain the row information as a separate column. Since data is ordered already by the Date column, you can use the following:

window value:ROWNUMBER() order:Date

Rename this column to rowId for week of quarter.

Now, you want to extract month and week information from the Date values. Deriving the month value:

derive type:single value:MONTH(Date) as:'Month'

Deriving the quarter value:

derive type:single value:(1 + FLOOR(((month-1)/3))) as:'QTR'

Deriving the week-of-quarter value:

window value:ROWNUMBER() order:Date group:QTR

Rename this column WOQ (week of quarter).

Deriving the week-of-month value:

window value:ROWNUMBER() group:Month order:Date

Rename this column WOM (week of month).

Now, you perform your rolling computations. Compute the running total of sales using the following:

window value: ROLLINGSUM(Sales, -1, 0) order: Date group:QTR

The -1 parameter is used in the above computation to gather the rolling sum of all rows of data from the current one to the first one. Note that the use of the QTR column for grouping, which moves the value for the 01/01/2017 into its own computational bucket. This may or may not be preferred.

Rename this column QTD (quarter to-date). Now, generate a similar column to compute the rolling average of weekly sales for the quarter:

window value: ROUND(ROLLINGAVERAGE(Sales, -1, 0)) order: Date group:QTR

Since the ROLLINGAVERAGE function can compute fractional values, it is wrapped in the ROUND function for neatness. Rename this column avgWeekByQuarter.

Results:

When the unnecessary columns are dropped and some reordering is applied, your dataset should look like the following:

Date	WOQ	Sales	QTD	avgWeekByQuarter
10/2/16	1	200	200	200
10/9/16	2	500	700	350
10/16/16	3	350	1050	350
10/23/16	4	400	1450	363
10/30/16	5	190	1640	328
11/6/16	6	550	2190	365
11/13/16	7	610	2800	400
11/20/16	8	480	3280	410
11/27/16	9	660	3940	438
12/4/16	10	690	4630	463
12/11/16	11	810	5440	495
12/18/16	12	950	6390	533
12/25/16	13	1020	7410	570
1/1/17	1	680	680	680

See Also for ROWNUMBER Function:

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ROWNUMBER Function

Basic Usage

Syntax and Arguments

Examples

Example - Rolling window functions