ST_distanceWithin-AnalyticDB(AnalyticDB)-阿里云帮助中心

Returns true if the distance between two trajectory objects is within the reference distance during the specified time range.

Syntax

boolean ST_distanceWithin(trajectory traj1, trajectory traj2, tsrange range, float8 d);
boolean ST_distanceWithin(trajectory traj1, trajectory traj2, timestamp t1, timestamp t2, float8 d);

Parameters

Parameter	Description
`traj1`, `traj2`	The trajectory objects to compare.
`range`	The time range, as a `tsrange` value.
`t1`	The start of the time range, as a `timestamp`.
`t2`	The end of the time range, as a `timestamp`.
`d`	The reference distance, as a `float8`.

Examples

The following example checks whether two moving objects in traj_table came within 100 units of each other between 13:00 and 14:00 on January 1, 2010.

Select ST_distanceWithin((Select traj from traj_table where id=1), (Select traj from traj_table where id=2), '2010-1-1 13:00:00', '2010-1-1 14:00:00', 100);