DESCRIBE Function Examples | Teradata Vantage - Examples - 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™

Example: Using DESCRIBE to Find the Temperature

/*PTI Table*/
SELECT $TD_TIMECODE_RANGE, $TD_GROUP_BY_TIME, BUOYID, DESCRIBE(TEMPERATURE)
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 2,3,4;

/*Non-PTI Table*/
SELECT $TD_TIMECODE_RANGE, $TD_GROUP_BY_TIME, BUOYID, DESCRIBE(TEMPERATURE)
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 2,3,4;

The results are the same for both tables:

TIMECODE_RANGE GROUP BY TIME (MINUTES (10)) BUOYID Max (TEMPER-ATURE) Min (TEMPER-ATURE) Average (TEMPER-ATURE) Stddev_ Samp (TEMPER-ATURE)
('2014-01-06 08:00:00.000000+00:00', '2014-01-06 08:10:00.000000+00:00') 1 0 99 10 55 62.9325
('2014-01-06 08:10:00.000000+00:00', '2014-01-06 08:20:00.000000+00:00') 2 0 100 10 54 63.6396
('2014-01-06 09:00:00.000000+00:00', '2014-01-06 09:10:00.000000+00:00') 7 1 79 70 74 3.9479
('2014-01-06 10:00:00.000000+00:00', '2014-01-06 10:10:00.000000+00:00') 13 44 56 43 43 5.7581
('2014-01-06 10:10:00.000000+00:00', '2014-01-06 10:20:00.000000+00:00') 14 44 43 43 50 ?

Example: Using the VERBOSE Option

/*PTI Table*/
SELECT $TD_TIMECODE_RANGE, $TD_GROUP_BY_TIME, BUOYID, DESCRIBE VERBOSE(TEMPERATURE)
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 2,3,4;

/*Non-PTI Table*/
SELECT $TD_TIMECODE_RANGE, $TD_GROUP_BY_TIME, BUOYID, DESCRIBE VERBOSE(TEMPERATURE)
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 2,3,4;

The results are the same for both tables:

TIMECODE_ RANGE GROUP BY TIME (MINUTES (10)) BUOY- ID Max (TEM- PERA- TURE) Min (TEM- PERA- TURE) Average (TEM- PERA- TURE) Stddev_ Samp (TEMPER- ATURE) Median (TEM- PERA- TURE) Mode (TEM-PERA- TURE) Percentile (TEMPER- ATURE,25) Percentile (TEMPER- ATURE,5) Percentile (TEMPER- ATURE,75)
('2014-01-06 10:10:00.000000+ 00:00', '2014-01-06 10:20:00.000000+ 00:00') 14 44 43 43 50 ? 43 43 43 43 43
('2014-01-06 10:00:00.000000+ 00:00', '2014-01-06 10:10:00.000000+ 00:00') 13 44 56 43 43 5.7581 53 43 43 53 53.75
('2014-01-06 09:00:00.000000+ 00:00', '2014-01-06 09:10:00.000000+ 00:00') 7 1 79 70 74 3.9479 74.5 70 71.25 74.5 77.75
('2014-01-06 09:00:00.000000+ 00:00', '2014-01-06 09:10:00.000000+ 00:00') 7 1 79 70 74 3.9479 74.5 71 71.25 74.5 77.75
('2014-01-06 09:00:00.000000+ 00:00', '2014-01-06 09:10:00.000000+ 00:00') 7 1 79 70 74 3.9479 74.5 72 71.25 74.5 77.75
('2014-01-06 09:00:00.000000+ 00:00', '2014-01-06 09:10:00.000000+ 00:00') 7 1 79 70 74 3.9479 74.5 77 71.25 74.5 77.75
('2014-01-06 09:00:00.000000+ 00:00', '2014-01-06 09:10:00.000000+ 00:00') 7 1 79 70 74 3.9479 74.5 78 71.25 74.5 77.75
('2014-01-06 09:00:00.000000+ 00:00', '2014-01-06 09:10:00.000000+ 00:00') 7 1 79 70 74 3.9479 74.5 79 71.25 74.5 77.75
('2014-01-06 08:10:00.000000+ 00:00', '2014-01-06 08:20:00.000000+ 00:00') 2 0 100 10 54 63.6396 55 10 32.5 55 77.5
('2014-01-06 08:10:00.000000+ 00:00', '2014-01-06 08:20:00.000000+ 00:00') 2 0 100 10 54 63.6396 55 100 32.5 55 77.5
('2014-01-06 08:00:00.000000+ 00:00', '2014-01-06 08:10:00.000000+ 00:00') 1 0 99 10 55 62.9325 54.5 10 32.25 54.5 76.75
('2014-01-06 08:00:00.000000+ 00:00', '2014-01-06 08:10:00.000000+ 00:00') 1 0 99 10 55 62.9325 54.5 99 32.25 54.5 76.75

Example: Filtering Out Rows with NULL Values for STDDEV_SAMP Using the HAVING Clause

/*PTI Table*/
SELECT $TD_TIMECODE_RANGE, $TD_GROUP_BY_TIME, BUOYID, DESCRIBE(TEMPERATURE)
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 2,3,4;

/*Non-PTI Table*/
SELECT $TD_TIMECODE_RANGE, $TD_GROUP_BY_TIME, BUOYID, DESCRIBE(TEMPERATURE)
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 2,3,4;

The results are the same for both tables:

TIMECODE_ RANGE GROUP BY TIME(MINUTES (10)) BUOYID Max (TEMPER-ATURE) Min (TEMPER-ATURE) Average (TEMPER-ATURE) Stddev_ Samp (TEMPER-ATURE)
('2014-01-06 09:00:00.000000+00:00', '2014-01-06 09:10:00.000000+00:00') 7 1 79 70 74 4
('2014-01-06 10:00:00.000000+00:00', '2014-01-06 10:10:00.000000+00:00') 13 44 56 43 43 6
('2014-01-06 08:00:00.000000+00:00', '2014-01-06 08:10:00.000000+00:00') 1 0 99 10 55 63
('2014-01-06 08:10:00.000000+00:00', '2014-01-06 08:20:00.000000+00:00') 2 0 100 10 54 64