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A little help for the Nearest Neighbor approach: WITH pts AS ( SELECT <id>, dmp.path[1] AS seq, dmp.geom FROM <lines> AS ln, LATERAL ST_DumpPoints(ln.geom) AS dmp ) SELECT pts.<id>, pts.seq, nw.<id>, ST_LineLocatePoint(nw.geom, pts.geom) AS frac FROM pts CROSS ...

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