ST_attrFloatMax

Syntax

float8 ST_attrFloatMax(trajectory traj, cstring attr_field_name);

Parameters

Return value

Returns the maximum value of the specified float-type attribute field as float8.

Examples

The following example creates a trajectory with a heading attribute field that has 16 float values, then returns the maximum value of that field.

SELECT ST_attrFloatMax(
    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 09:13:39',
            '2017-01-15 09:14:48',
            '2017-01-15 09:16:28',
            '2017-01-15 09:17:48',
            '2017-01-15 09:19:48',
            '2017-01-15 09:23:19',
            '2017-01-15 09:30:28',
            '2017-01-15 09:34:40',
            '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 09:48:49',
            '2017-01-15 21:18:30'
        ],
        '{"leafcount": 16, "attributes": {"heading": {"type": "float", "length": 4, "nullable": false, "value": [23.0,23.0,23.0,23.0,21.0,21.0,72.0,72.0,72.0,72.0,73.0,74.0,73.0,73.0,73.0,73.0]}}}'
    ),
    'heading'
);

Expected output:

 st_attrfloatmax
-----------------
              74