Handling Missing Values | Teradata Vantage - Handling Missing Values within a Timebucket - Advanced SQL Engine - Teradata Database

When a missing value is present within a timebucket (for example, the NULL value inserted in the TEMPERATURE column in Table and Data Definition for Time Series Aggregates Examples), the value is ignored and it is not included in the calculation of the aggregate result. This is consistent with the behavior of existing aggregate functions in Vantage.

The example shows the result of an AVERAGE with NULL values:

SELECT $TD_TIMECODE_RANGE, $TD_GROUP_BY_TIME, BUOYID, AVG(TEMPERATURE), COUNT(*)
FROM OCEAN_BUOYS
WHERE TD_TIMECODE BETWEEN TIMESTAMP '2014-01-06 08:00:00' AND TIMESTAMP '2014-01-06 10:30:00'
AND BUOYID = 0
GROUP BY TIME (MINUTES(10) AND BUOYID)
ORDER BY 2,3;

Result:

The null value was omitted from the result calculation.