PolarDB:ST_AsTable

Syntax

trajectory ST_AsTable (trajectory traj);

Parameters

Description

This function converts trajectories into a table. The form of the table must be consistent with Syntax 5 in the ST_makeTrajectory topic.

Examples

-- Output tuple
With traj AS (
    select '{"trajectory":{"version":1,"type":"STPOINT","leafcount":2,"start_time":"2010-01-01 11:30:00","end_time":"2010-01-01 12:30:00","spatial":"SRID=4326;LINESTRING(1 1,3 5)","timeline":["2010-01-01 11:30:00","2010-01-01 12:30:00"]}}'::trajectory a
)
select ST_AsTable(a) from traj;
         st_astable
-----------------------------
 ("2010-01-01 11:30:00",1,1)
 ("2010-01-01 12:30:00",3,5)
(2 rows)

-- Output table
select * from ST_AsTable('{"trajectory":{"version":1,"type":"STPOINT","leafcount":2,"start_time":"2010-01-01 11:30:00","end_time":"2010-01-01 12:30:00","spatial":"SRID=4326;LINESTRING(1 1,3 5)","timeline":["2010-01-01 11:30:00","2010-01-01 12:30:00"]}}'::trajectory) as f(t timestamp,x double precision, y double precision);
          t          | x | y
---------------------+---+---
 2010-01-01 11:30:00 | 1 | 1
 2010-01-01 12:30:00 | 3 | 5
(2 rows)