delta

Introduction

Use the delta instruction to return a delta of your data extracts. A delta is a comparison of data extracts that finds unique rows, and returns these rows in a new data extract.

Creating a custom script transformation using the delta instruction

To create and configure a custom script using the delta instruction, follow these steps:

1. Create a custom script transformation.

2. In the Instruction step, select the delta instruction.

3. To configure the custom script instruction, fill in the following fields. Required fields are marked with an asterisk (*).

All

Select this checkbox to include all previous data extracts from the datastream in the comparison. The initial data extract contains all values, and each subsequent extract adds only the new rows found.

Distinct

Select this checkbox to create a new data extract that contains the unique rows found using the comparison.

Include Tags

Enter keywords to include specific data extracts in the comparison.

Exclude Tags

Enter keywords to exclude specific data extracts from the comparison.

Presorted

Select this checkbox if the included data extracts are presorted.

Subtable

Enter the name for a subtable that you want to use within this custom script.

A subtable is a temporary table that only exists for this custom script. You can apply additional instructions within the same custom script to the subtable. However, the subtable cannot be used in any other custom scripts.

If a subtable does not exist for the current custom script, the transformation is applied to the data extract, and the enriched data is output into the subtable. If the subtable already exists for the custom script, the subtable is used as the input for the transformation and optionally as the output.

Examples

The following examples show how the delta instruction finds unique rows across two data extracts.