例: 時系列でSKEWの使用 - Teradata Database - Teradata Vantage NewSQL Engine

PTIテーブルの場合:

SELECT $TD_TIMECODE_RANGE, $TD_GROUP_BY_TIME, BUOYID, SKEW(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 3,2,1;

非PTIテーブルの場合:

SELECT $TD_TIMECODE_RANGE, $TD_GROUP_BY_TIME, BUOYID, SKEW(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 3,2,1;

結果: