Use ST_IsExternal to determine whether a trajectory is stored externally-PolarDB(PolarDB)-阿里云帮助中心

Determines whether a trajectory is stored externally.

Note

This function is expected to be deprecated in a later version. Use Cold data tiered storage for a better experience.

Syntax

bool ST_IsExternal(trajectory traj);

Parameter	Description
traj	The trajectory object.

Returns t if the trajectory is stored externally. Otherwise, returns f.

SELECT ST_IsExternal(traj) FROM trajs;
 st_isexternal 
---------------
 t
 t
 t
 f
 t
(5 rows)