STDDEV_SAMP Function Examples | Teradata Vantage - Example: Using STDDEV_SAMP with Time Series - Analytics Database - Teradata Vantage

Time Series Tables and Operations
Deployment
VantageCloud
VantageCore
Edition
Enterprise
IntelliFlex
VMware
Product
Analytics Database
Teradata Vantage
Release Number
17.20
Published
June 2022
Language
English (United States)
Last Update
2023-10-30
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lifecycle
latest
Product Category
Teradata Vantage™

For a PTI table:

SELECT $TD_TIMECODE_RANGE, $TD_GROUP_BY_TIME, BUOYID, STDDEV_SAMP(CAST(TEMPERATURE AS REAL))
FROM OCEAN_BUOYS
WHERE TD_TIMECODE BETWEEN TIMESTAMP '2014-01-06 08:00:00' AND TIMESTAMP '2014-01-06 10:30:00'
GROUP BY TIME (MINUTES(10) AND BUOYID)
ORDER BY 3,2,1;

For a non-PTI table:

SELECT $TD_TIMECODE_RANGE, $TD_GROUP_BY_TIME, BUOYID, STDDEV_SAMP(CAST(TEMPERATURE AS REAL))
FROM OCEAN_BUOYS_NONPTI
WHERE TIMECODE BETWEEN TIMESTAMP '2014-01-06 08:00:00' AND TIMESTAMP '2014-01-06 10:30:00'
GROUP BY TIME (MINUTES(10) AND BUOYID)
USING TIMECODE(TIMECODE)
ORDER BY 3,2,1;

Result:

The results of both queries are identical so only one result set is shown.
TIMECODE_RANGE GROUP BY TIME (MINUTES(10)) BUOYID Stddev_Samp (TEMPERATURE)
('2014-01-06 10:10:00.000000+00:00', '2014-01-06 10:20:00.000000+00:00') 14 44 ?
('2014-01-06 10:00:00.000000+00:00', '2014-01-06 10:10:00.000000+00:00') 13 44 5.75808610178378E 000
('2014-01-06 09:00:00.000000+00:00', '2014-01-06 09:10:00.000000+00:00') 7 1 3.93700393700591E 000
('2014-01-06 08:10:00.000000+00:00', '2014-01-06 08:20:00.000000+00:00') 2 0 6.36396103067893E 001
('2014-01-06 08:00:00.000000+00:00', '2014-01-06 08:10:00.000000+00:00') 1 0 6.29325035256027E 001

Example: Filtering Out NULL Results with the HAVING Clause

For a PTI table:

SELECT $TD_TIMECODE_RANGE, $TD_GROUP_BY_TIME, BUOYID, STDDEV_SAMP(CAST(TEMPERATURE AS REAL))
FROM OCEAN_BUOYS
WHERE TD_TIMECODE BETWEEN TIMESTAMP '2014-01-06 08:00:00' AND TIMESTAMP '2014-01-06 10:30:00'
GROUP BY TIME (MINUTES(10) AND BUOYID)
HAVING STDDEV_SAMP(TEMPERATURE) IS NOT NULL
ORDER BY 3,2,1;

For a non-PTI table:

SELECT $TD_TIMECODE_RANGE, $TD_GROUP_BY_TIME, BUOYID, STDDEV_SAMP(CAST(TEMPERATURE AS REAL))
FROM OCEAN_BUOYS_NONPTI
WHERE TIMECODE BETWEEN TIMESTAMP '2014-01-06 08:00:00' AND TIMESTAMP '2014-01-06 10:30:00'
GROUP BY TIME (MINUTES(10) AND BUOYID)
USING TIMECODE(TIMECODE)
HAVING STDDEV_SAMP(TEMPERATURE) IS NOT NULL
ORDER BY 3,2,1;

Result:

The results of both queries are identical so only one result set is shown.
TIMECODE_RANGE GROUP BY TIME (MINUTES(10)) BUOYID Stddev_Samp (TEMPERATURE)
('2014-01-06 08:00:00.000000+00:00', '2014-01-06 08:10:00.000000+00:00') 1 0 6.29325035256027E 001
('2014-01-06 08:10:00.000000+00:00', '2014-01-06 08:20:00.000000+00:00') 2 0 6.36396103067893E 001
('2014-01-06 09:00:00.000000+00:00', '2014-01-06 09:10:00.000000+00:00') 7 1 3.93700393700591E 000
('2014-01-06 10:00:00.000000+00:00', '2014-01-06 10:10:00.000000+00:00') 13 44 5.75808610178378E 000