TOP Function Examples | Teradata Vantage - 17.00 - Examples - Teradata Database

Teradata Vantageā„¢ - Time Series Tables and Operations

prodname
Advanced SQL Engine
Teradata Database
vrm_release
17.00
created_date
June 2020
category
Programming Reference
featnum
B035-1208-170K

Example: Using TOP Without TIES

/*PTI Table*/SELECT $TD_TIMECODE_RANGE, $TD_GROUP_BY_TIME, BUOYID, TOP(2, TEMPERATURE)
FROM OCEAN_BUOYS
WHERE TD_TIMECODE BETWEEN TIMESTAMP '2014-01-06 10:00:00' AND TIMESTAMP '2014-01-06 10:06:00' AND BUOYID=44
GROUP BY TIME (MINUTES(2) AND BUOYID) FILL(NULLS)
ORDER BY 1, 4, 3;

/*Non-PTI Table*/
SELECT $TD_TIMECODE_RANGE, $TD_GROUP_BY_TIME, BUOYID, TOP(2, TEMPERATURE)
FROM OCEAN_BUOYS_NONPTI
WHERE TIMECODE BETWEEN TIMESTAMP '2014-01-06 10:00:00' AND TIMESTAMP '2014-01-06 10:06:00' AND BUOYID=44
GROUP BY TIME (MINUTES(2) AND BUOYID)
USING TIMECODE(TIMECODE)
FILL(NULLS)
ORDER BY 1, 4, 3;

The results are the same for both tables:

TIMECODE_RANGE GROUP BY TIME (MINUTES(10)) BUOYID TEMPERATURE
('2014-01-06 10:00:00.000000+00:00', '2014-01-06 10:02:00.000000+00:00') 1 44 ?
('2014-01-06 10:00:00.000000+00:00', '2014-01-06 10:02:00.000000+00:00') 1 44 ?
('2014-01-06 10:00:00.000000+00:00', '2014-01-06 10:02:00.000000+00:00') 1 44 53
('2014-01-06 10:00:00.000000+00:00', '2014-01-06 10:02:00.000000+00:00') 1 44 54
('2014-01-06 10:02:00.000000+00:00', '2014-01-06 10:04:00.000000+00:00') 2 44 ?
('2014-01-06 10:02:00.000000+00:00', '2014-01-06 10:04:00.000000+00:00') 2 44 ?
('2014-01-06 10:02:00.000000+00:00', '2014-01-06 10:04:00.000000+00:00') 2 44 55
('2014-01-06 10:02:00.000000+00:00', '2014-01-06 10:04:00.000000+00:00') 2 44 56
('2014-01-06 10:04:00.000000+00:00', '2014-01-06 10:06:00.000000+00:00') 3 44 ?
('2014-01-06 10:04:00.000000+00:00', '2014-01-06 10:06:00.000000+00:00') 3 44 ?
('2014-01-06 10:04:00.000000+00:00', '2014-01-06 10:06:00.000000+00:00') 3 44 ?
('2014-01-06 10:04:00.000000+00:00', '2014-01-06 10:06:00.000000+00:00') 3 44 ?

Example: Using TOP With TIES

/*PTI Table*/
SELECT $TD_TIMECODE_RANGE, $TD_GROUP_BY_TIME, BUOYID, TOP WITH TIES(2, TEMPERATURE)
FROM OCEAN_BUOYS
WHERE TD_TIMECODE BETWEEN TIMESTAMP '2014-01-06 10:00:00' AND TIMESTAMP '2014-01-06 10:06:00' AND BUOYID=44
GROUP BY TIME (MINUTES(2) AND BUOYID) FILL(NULLS)
ORDER BY 1, 4, 3;

/*Non-PTI Table*/
SELECT $TD_TIMECODE_RANGE, $TD_GROUP_BY_TIME, BUOYID, TOP WITH TIES(2, TEMPERATURE)
FROM OCEAN_BUOYS_NONPTI
WHERE TIMECODE BETWEEN TIMESTAMP '2014-01-06 10:00:00' AND TIMESTAMP '2014-01-06 10:06:00' AND BUOYID=44
GROUP BY TIME (MINUTES(2) AND BUOYID)
USING TIMECODE(TIMECODE)
FILL(NULLS)
ORDER BY 1, 4, 3;

The results are the same for both tables:

TIMECODE_RANGE GROUP BY TIME (MINUTES(10)) BUOYID TEMPERATURE
('2014-01-06 10:00:00.000000+00:00', '2014-01-06 10:02:00.000000+00:00') 1 44 53
('2014-01-06 10:00:00.000000+00:00', '2014-01-06 10:02:00.000000+00:00') 1 44 54
('2014-01-06 10:02:00.000000+00:00', '2014-01-06 10:04:00.000000+00:00') 2 44 55
('2014-01-06 10:02:00.000000+00:00', '2014-01-06 10:04:00.000000+00:00') 2 44 56
('2014-01-06 10:04:00.000000+00:00', '2014-01-06 10:06:00.000000+00:00') 3 44 ?
('2014-01-06 10:04:00.000000+00:00', '2014-01-06 10:06:00.000000+00:00') 3 44 ?