CCNA, CCNP, MCSA, CCNA Final Exam, All Answer Test Module With 100/100

(note: the_geom is a geometry value (TYPE: LINESTRING), in this case i random them for readability) gid | kstart | kend | ctrl_sec_no | the_geom | the_sum_geom 626 | 238 | 239 | 120802 | 123456 | NULL 638 | 249 | 250 | 120802 | 234567 | NULL 4037| 239 | 249 | 120802 | 345678 | NULL [Real Practice Description] just skip this for those who don't mind the purpose I would like to do 'this' (a set of queries from my past question, link located on the end of this post) for every row in Table B (aka. land_inventory). These two tables are related by 'ctrl_sec_no' (aka. control section number of a road) which means :: in ONE ctrl_sec_no -- 120802 (in fact, it is a road which is equivalent to 3 geometry LINESTRINGs (the_geom) connected together, from kstart 238 (start at kilometre of 238) to kend 250) [PostGIS question] the question is how to connect this 3 lines {aka gid(626,638,4037) from the table} together a