Unpack Function Example | Teradata Vantage - Example: Delimiter Separates Virtual Columns - Analytics Database

Unpack Input

The input table, ville_tempdata, is a collection of temperature readings for two cities, Nashville and Knoxville, in the state of Tennessee. In the column of packed data, the delimiter comma (,) separates the virtual columns. The last row contains invalid data.

Unpack SQL Call with Delimiter Separates Virtual Columns

Because comma is the default delimiter, the Delimiter syntax element is optional.

SELECT * FROM Unpack (
  ON ville_tempdata AS InputTable
  USING
  TargetColumn ('packed_temp_data')
  OutputColumns ('city', 'state', 'temp_f')
  OutputDataTypes ('varchar', 'varchar', 'real')
  Delimiter (',') 
  Regex ('(.*)')
  RegexSet (1)
  IgnoreInvalid ('true')
  Accumulate ('sn')
) AS dt ORDER BY sn;

Unpack Output with Delimiter Separates Virtual Columns

Because of IgnoreInvalid ('true'), the function did not fail when it encountered the row with invalid data, but it did not output that row.