Example: Calculating the Kurtosis for PTI and non-PTI Tables
The following example shows how the Kurtosis function can be used with both Primary Time Index (PTI) and non-PTI tables.
The examples use the tables and data setup in Table and Data Definition for Time Series Aggregates Examples.
/*PTI Table*/ SELECT $TD_TIMECODE_RANGE, $TD_GROUP_BY_TIME, BUOYID, KURTOSIS(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; /*Non-PTI Table*/ SELECT $TD_TIMECODE_RANGE, $TD_GROUP_BY_TIME, BUOYID, KURTOSIS(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;
Result:
The results of both queries are identical so only one result set is shown.
TIMECODE_RANGE | GROUP BY TIME (MINUTES(10)) | BUOYID | Kurtosis (TEMPERATURE) |
---|---|---|---|
('2014-01-06 08:00:00.000000+00:00', '2014-01-06 08:10:00.000000+00:00') | 1 | 0 | ? |
('2014-01-06 08:10:00.000000+00:00', '2014-01-06 08:20:00.000000+00:00') | 2 | 0 | ? |
('2014-01-06 09:00:00.000000+00:00', '2014-01-06 09:10:00.000000+00:00' | 7 | 1 | -2.75837669094693E 000 |
('2014-01-06 10:00:00.000000+00:00', '2014-01-06 10:10:00.000000+00:00') | 13 | 44 | -2.17645648488608E 000 |
('2014-01-06 10:10:00.000000+00:00', '2014-01-06 10:20:00.000000+00:00') | 14 | 44 | ? |
Example: Using the HAVING Clause to Filter Out NULL Results for the Kurtosis Function
The following example shows how the Kurtosis function can be used with the HAVING clause to filter the results.
The examples use the tables and data setup in Table and Data Definition for Time Series Aggregates Examples.
/*PTI Table*/ SELECT $TD_TIMECODE_RANGE, $TD_GROUP_BY_TIME, BUOYID, KURTOSIS(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 KURTOSIS(TEMPERATURE) IS NOT NULL ORDER BY 3,2,1; /*Non-PTI Table*/ SELECT $TD_TIMECODE_RANGE, $TD_GROUP_BY_TIME, BUOYID, KURTOSIS(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 KURTOSIS(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 | Kurtosis (TEMPERATURE) |
---|---|---|---|
('2014-01-06 09:00:00.000000+00:00', '2014-01-06 09:10:00.000000+00:00' | 7 | 1 | -2.75837669094693E 000 |
('2014-01-06 10:00:00.000000+00:00', '2014-01-06 10:10:00.000000+00:00') | 13 | 44 | -2.17645648488608E 000 |