How do I construct a LINESTRING by aggregating Points (ST_MakeLine) in MariaDB?












0















Let's say I have a table with 3 points,



CREATE TABLE foo ( id int PRIMARY KEY, geog point );
INSERT INTO foo (id, geog) VALUES
( 1, Point(0,0) ),
( 2, Point(1,1) ),
( 3, Point(2,2) );


How can I construct a LINESTRING with those three points in those three different rows. The resulting WKT should be LINESTRING( 0 0, 1 1, 2 2 )?





PostGIS does this with a Spatial Aggregate called ST_MakeLine



SELECT ST_MakeLine(geog)
FROM foo
ORDER BY id;









share|improve this question





























    0















    Let's say I have a table with 3 points,



    CREATE TABLE foo ( id int PRIMARY KEY, geog point );
    INSERT INTO foo (id, geog) VALUES
    ( 1, Point(0,0) ),
    ( 2, Point(1,1) ),
    ( 3, Point(2,2) );


    How can I construct a LINESTRING with those three points in those three different rows. The resulting WKT should be LINESTRING( 0 0, 1 1, 2 2 )?





    PostGIS does this with a Spatial Aggregate called ST_MakeLine



    SELECT ST_MakeLine(geog)
    FROM foo
    ORDER BY id;









    share|improve this question



























      0












      0








      0








      Let's say I have a table with 3 points,



      CREATE TABLE foo ( id int PRIMARY KEY, geog point );
      INSERT INTO foo (id, geog) VALUES
      ( 1, Point(0,0) ),
      ( 2, Point(1,1) ),
      ( 3, Point(2,2) );


      How can I construct a LINESTRING with those three points in those three different rows. The resulting WKT should be LINESTRING( 0 0, 1 1, 2 2 )?





      PostGIS does this with a Spatial Aggregate called ST_MakeLine



      SELECT ST_MakeLine(geog)
      FROM foo
      ORDER BY id;









      share|improve this question
















      Let's say I have a table with 3 points,



      CREATE TABLE foo ( id int PRIMARY KEY, geog point );
      INSERT INTO foo (id, geog) VALUES
      ( 1, Point(0,0) ),
      ( 2, Point(1,1) ),
      ( 3, Point(2,2) );


      How can I construct a LINESTRING with those three points in those three different rows. The resulting WKT should be LINESTRING( 0 0, 1 1, 2 2 )?





      PostGIS does this with a Spatial Aggregate called ST_MakeLine



      SELECT ST_MakeLine(geog)
      FROM foo
      ORDER BY id;






      mariadb spatial






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited 5 mins ago







      Evan Carroll

















      asked 22 mins ago









      Evan CarrollEvan Carroll

      31.6k966214




      31.6k966214






















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          Because MariaDB (and MySQL) lack all spatial aggregates, the only method is currently to create the WKT, and force MySQL to parse that WKT.



          SELECT CONCAT(
          'LINESTRING (',
          GROUP_CONCAT(CONCAT(ST_X(geog),' ',ST_Y(geog)) SEPARATOR ' '),
          ')'
          )
          FROM foo
          ORDER BY id;
          -- returns LINESTRING (0 0 1 1 2 2)


          The inside part



          GROUP_CONCAT(CONCAT(ST_X(geog),' ',ST_Y(geog)) SEPARATOR ' ')


          Creates the point list, and then we just wrap that in LINESTRING ( $pointlist )





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            Because MariaDB (and MySQL) lack all spatial aggregates, the only method is currently to create the WKT, and force MySQL to parse that WKT.



            SELECT CONCAT(
            'LINESTRING (',
            GROUP_CONCAT(CONCAT(ST_X(geog),' ',ST_Y(geog)) SEPARATOR ' '),
            ')'
            )
            FROM foo
            ORDER BY id;
            -- returns LINESTRING (0 0 1 1 2 2)


            The inside part



            GROUP_CONCAT(CONCAT(ST_X(geog),' ',ST_Y(geog)) SEPARATOR ' ')


            Creates the point list, and then we just wrap that in LINESTRING ( $pointlist )





            share




























              0














              Because MariaDB (and MySQL) lack all spatial aggregates, the only method is currently to create the WKT, and force MySQL to parse that WKT.



              SELECT CONCAT(
              'LINESTRING (',
              GROUP_CONCAT(CONCAT(ST_X(geog),' ',ST_Y(geog)) SEPARATOR ' '),
              ')'
              )
              FROM foo
              ORDER BY id;
              -- returns LINESTRING (0 0 1 1 2 2)


              The inside part



              GROUP_CONCAT(CONCAT(ST_X(geog),' ',ST_Y(geog)) SEPARATOR ' ')


              Creates the point list, and then we just wrap that in LINESTRING ( $pointlist )





              share


























                0












                0








                0







                Because MariaDB (and MySQL) lack all spatial aggregates, the only method is currently to create the WKT, and force MySQL to parse that WKT.



                SELECT CONCAT(
                'LINESTRING (',
                GROUP_CONCAT(CONCAT(ST_X(geog),' ',ST_Y(geog)) SEPARATOR ' '),
                ')'
                )
                FROM foo
                ORDER BY id;
                -- returns LINESTRING (0 0 1 1 2 2)


                The inside part



                GROUP_CONCAT(CONCAT(ST_X(geog),' ',ST_Y(geog)) SEPARATOR ' ')


                Creates the point list, and then we just wrap that in LINESTRING ( $pointlist )





                share













                Because MariaDB (and MySQL) lack all spatial aggregates, the only method is currently to create the WKT, and force MySQL to parse that WKT.



                SELECT CONCAT(
                'LINESTRING (',
                GROUP_CONCAT(CONCAT(ST_X(geog),' ',ST_Y(geog)) SEPARATOR ' '),
                ')'
                )
                FROM foo
                ORDER BY id;
                -- returns LINESTRING (0 0 1 1 2 2)


                The inside part



                GROUP_CONCAT(CONCAT(ST_X(geog),' ',ST_Y(geog)) SEPARATOR ' ')


                Creates the point list, and then we just wrap that in LINESTRING ( $pointlist )






                share











                share


                share










                answered 9 mins ago









                Evan CarrollEvan Carroll

                31.6k966214




                31.6k966214






























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