如何在空间 sql 查询中检查表 1 中的点几何是否存在于表 2 中的线几何

Question

I have two tables, table 1 is valve - POINT geometry
table 2 is tbline - LINE geometry. I need to get the valve_id from valve if valve.geometry exists in tbline.geometry and I need to identify which point do valve_id positioned its either startpoint or EndPoint?
Any help is much appreciated. Currently, this is my query, I'm stuck here:

;WITH CTE_A AS (
    select a.valve_id, a.elevation,geometry from valve a 
)
Select
b.valve_id as startnode,B.elevation from tblline C INNER JOIN CTE_A B  ON c.geometry.STStartPoint().STTouches(B.geometry) = 1 
union
SELECT b.valve_id as endnode,b.elevation from tblline d INNER JOIN CTE_A B  ON d.geometry.STEndPoint().STTouches(B.geometry) = 1 

Here's my expected output: [expected result][1]

table - valve

valve_id	PointX	PointY
VLV873	533726.788191639	1030389.94089809
VLV289	533726.403676326	1030390.12088887

table - tblline

StartX	StartY	EndX	EndY
533726.788191639	1030389.94089809	533726.403676326	1030390.12088887

below is my expected result in which I need to update this to tblline start_node and end_node column:

startnode	endnode
VLV873	VLV289

Answer 1

Since the coordinates are stored with limited precision it's often impractical to determine of two shapes "touch". Instead select a small buffer distance and test if they overlap. So "touching" is replaced by "within 0.001 units" or somesuch. eg

use tempdb

drop table if exists valve
drop table if exists tblline
go
create table valve(valve_id varchar(20) primary key, elevation float default 0, geometry geometry)
create table tblline (id int identity primary key, geometry geometry)

insert into valve(valve_id, geometry) 
    values ('VLV873', geometry::Point(533726.788191639, 1030389.94089809,0))
insert into valve(valve_id, geometry) 
    values ('VLV289', geometry::Point(533726.403676326, 1030390.12088887,0))

insert into tblline(geometry) 
    values (geometry::STLineFromText('LINESTRING (533726.788191639 1030389.94089809, 533726.403676326 1030390.12088887)',0))
--visualize the results
select geometry.STBuffer(0.001) from tblline
union all
select geometry.STBuffer(0.02) from valve 

go

;WITH CTE_A AS (
    select a.valve_id, a.elevation,geometry from valve a 
)
Select b.valve_id as startnode,B.elevation 
from tblline C 
INNER JOIN CTE_A B  
  ON c.geometry.STStartPoint().STBuffer(0.001).STIntersects(B.geometry) = 1 
union
SELECT b.valve_id as endnode,b.elevation 
from tblline d 
INNER JOIN CTE_A B  
    ON d.geometry.STEndPoint().STBuffer(0.001).STIntersects(B.geometry) = 1 

outputs

and

startnode            elevation
-------------------- ----------------------
VLV289               0
VLV873               0

(2 rows affected)