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

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.

SQL Call

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

SELECT * FROM Unpack (
  ON ville_tempdata
  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;

Output

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