Returns the maximum value of an integer-type attribute field in a trajectory object.
Syntax
int8 ST_attrIntMax(trajectory traj, cstring attr_field_name);Parameters
| Parameter | Description |
|---|---|
| traj | The trajectory object. |
| attr_field_name | The name of the attribute field. |
Examples
The following example retrieves the maximum value of the heading attribute field from a trajectory that has 16 spatial-temporal points with heading values from 0 to 15. The result is 15.
SELECT st_attrIntMax(
ST_makeTrajectory(
'STPOINT'::leaftype,
'LINESTRING(-179.48077 51.72814,-179.46731 51.74634,-179.46502 51.74934,-179.46183 51.75378,-179.45943 51.75736,-179.45560 51.76273,-179.44845 51.77186,-179.43419 51.78977,-179.41259 51.81643,-179.41001 51.81941,-179.40751 51.82223,-179.40497 51.82505,-179.40242 51.82796,-179.39981 51.83095,-179.39734 51.83398,-179.39499 51.83709)'::geometry,
ARRAY[
'2017-01-15 09:06:39'::timestamp,
'2017-01-15 09:14:48',
'2017-01-15 09:13:39',
'2017-01-15 09:16:28',
'2017-01-15 09:19:48',
'2017-01-15 09:17:48',
'2017-01-15 09:23:19',
'2017-01-15 09:34:40',
'2017-01-15 09:30:28',
'2017-01-15 09:36:59',
'2017-01-15 09:38:09',
'2017-01-15 09:39:18',
'2017-01-15 09:40:40',
'2017-01-15 09:47:38',
'2017-01-15 21:18:30',
'2017-01-15 09:48:49'
],
'{"leafcount": 16, "attributes": {"heading": {"type": "integer", "length": 4, "nullable": false, "value": [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15]}}}'
),
'heading'
);
st_attrintmax
---------------
15