17.10 - Example: FILL with NULLS - Advanced SQL Engine - Teradata Database

Teradata Vantageā„¢ - Time Series Tables and Operations

Product
Advanced SQL Engine
Teradata Database
Release Number
17.10
Release Date
July 2021
Content Type
Programming Reference
Publication ID
B035-1208-171K
Language
English (United States)

Use the FILL clause to replace missing values with NULL for timebuckets with missing values.

The example shows the results of the query when the FILL clause is used with NULLS:

SELECT $TD_TIMECODE_RANGE, $TD_GROUP_BY_TIME, BUOYID, AVG(TEMPERATURE)
FROM OCEAN_BUOYS
WHERE TD_TIMECODE BETWEEN TIMESTAMP '2014-01-06 09:45:00' AND TIMESTAMP '2014-01-06 11:45:00'
AND BUOYID=44
GROUP BY TIME (MINUTES(15) AND BUOYID) FILL(NULLS)
ORDER BY 2,3;

Result: The timebuckets with no value are included in the result set, with nulls in place of the missing values.

TIMECODE_RANGE GROUP BY TIME(MINUTES(15)) BUOYID AVG(TEMPERATURE)
('2014-01-06 09:45:00.000000+00:00', '2014-01-06 10:00:00.000000+00:00') 1 44 ?
('2014-01-06 10:00:00.000000+00:00', '2014-01-06 10:15:00.000000+00:00') 2 44 49
('2014-01-06 10:15:00.000000+00:00', '2014-01-06 10:30:00.000000+00:00') 3 44 ?
('2014-01-06 10:30:00.000000+00:00', '2014-01-06 10:45:00.000000+00:00') 4 44 43
('2014-01-06 10:45:00.000000+00:00', '2014-01-06 11:00:00.000000+00:00') 5 44 43
('2014-01-06 11:00:00.000000+00:00', '2014-01-06 11:15:00.000000+00:00') 6 44 ?
('2014-01-06 11:15:00.000000+00:00', '2014-01-06 11:30:00.000000+00:00') 7 44 ?
('2014-01-06 11:30:00.000000+00:00', '2014-01-06 11:45:00.000000+00:00') 8 44 ?