Example: Calculating a COUNT for PTI and non-PTI Tables
The following example shows how the COUNT 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, COUNT(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, COUNT(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 of both queries are identical so only one result set is shown.
TIMECODE_RANGE | GROUP BY TIME (MINUTES(10)) | BUOYID | Count (TEMPERATURE) |
---|---|---|---|
('2014-01-06 08:00:00.000000+00:00', '2014-01-06 08:10:00.000000+00:00') | 1 | 0 | 2 |
('2014-01-06 08:10:00.000000+00:00', '2014-01-06 08:20:00.000000+00:00') | 2 | 0 | 2 |
('2014-01-06 09:00:00.000000+00:00', '2014-01-06 09:10:00.000000+00:00' | 7 | 1 | 6 |
('2014-01-06 10:00:00.000000+00:00', '2014-01-06 10:10:00.000000+00:00') | 13 | 44 | 10 |
('2014-01-06 10:10:00.000000+00:00', '2014-01-06 10:20:00.000000+00:00') | 14 | 44 | 1 |