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A comment on Using the linear distance operator in Postgres 12 to find the closest match. Parent comment

Re:Using the linear distance operator in Postgres 12 to find... by deckar01 on Thursday November 07, 2019 @10:45AM (#21474172)
Its point structure supports 4 dimensions, but I'm not sure if the Z and M components are part of the distance calculation.

https://postgis.net/docs/manual-3.0/ST_MakePoint.html

Edit: The distance operations are 2D by default and it looks like there are only 3D variants.

https://postgis.net/docs/manual-3.0/ST_3DDistance.html

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