Converting multiple points to line

Question

Hi All
I have table consist of point data.. how to convert multiple points to line data.. if anyknows pls tell me ..
Thak you

Answer 1

user13340372,
. . . .Are you trying to draw a line between 2 points or draw a line connecting N points?
How to Create a Line From 2 Points_
. . . .You could use the SDO_Geometry constructor. For example, if you have a table POINTS defined as (ID NUMBER, FromPt SDO_GEOMETRY, ToPt SDO_GEOMETRY), then you could:
SELECT 
    SDO_GEOMETRY(
    'LINESTRING ('||
    -- concatenate coordinates from FromPt
    REPLACE(REPLACE(p.FromPt.Get_WKT(), 'POINT (', NULL), ')', NULL)||','||
    -- concatenate coordinates from ToPt
    REPLACE(REPLACE(p.ToPt.Get_WKT(), 'POINT (', NULL), ')', NULL)||')'
    ---  SRID
    , 4326)
FROM
    POINTS p;              
How to Create a Line From N Points_
. . . .In a "connect-the-dots" puzzle, you draw lines from one numbered point to the next numbered point. There, the numbers define how points are related. If you dont have that information, then you need to decide how you want your points connected. Here are a few options - your requirements should indicate which (if any) is suitable:
. . . .(a) Draw Arbitrary Linestring Through Points: user10278189 already posted that PL/SQL solution (above).
. . . .(b) Connect Nearest Neigbors: set CURRENT_POINT to a point (e.g., bottom-left). Then identify its nearest-neighbor (hereinafter, "NextPoint") using SDO_NN. Flag NextPoint as "visited" and set CURRENT_POINT to NextPoint. Repeat until all points in the point-set are flagged as "visited." The result ( which depends on the starting point ) is a linestring connecting all points (a "line" is only between 2 points; a linestring is between 2 or more points). This requires PL/SQL.
. . . .(c) Draw Along Shortest Distances: Create a table containing: FromPt_ID, toPt_ID and distances between each pair of points. (If you do this via a cross product, remove rows where FromPt_ID = ToPt_ID.) Begin connecting the points with the minimum distance from the last "visited" point (as before, flag the points that have been used as "visited"). The result of this operation is the shortest linestring connecting your point-set. This requires PL/SQL.
. . . .(d) Outline Set of Points: You could also use the SDO_GEOM.Sdo_ConvexHull function to create polygon that encloses your point set, and then use SDO_UTIL.PolygonToLine to turn that area-geometry into a line-geometry. This can probably be done in a single statement.
. . . .(e) Others (TSP, spanning tree, etc).
Regards,
Noel