PREV - Amazon Glue DataBrew
Services or capabilities described in Amazon Web Services documentation might vary by Region. To see the differences applicable to the China Regions, see Getting Started with Amazon Web Services in China (PDF).

PREV

Returns a new column, where each value represents a value that is n rows earlier in the source column.

Parameters
  • sourceColumn – The name of an existing column.

  • numRows – A value that represents n rows earlier in the source column. For example, if numRows is 3, then PREV uses the third-previous sourceColumn value as the new targetColumn value.

  • targetColumn – A name for the newly created column.

Example

{ "Action": { "Operation": "PREV", "Parameters": { "numRows": "1", "sourceColumn": "age", "targetColumn": "age_PREV" } } }