That is not the most efficient in this case. How to tell query to deliberately miss out all except the last one is of interest.Regards, David On Monday, 4 April 2022, Rob Sargent <robjsargent@gmail.com> wrote:On 4/4/22 16:14, Shaozhong SHI wrote:---------- Forwarded message --------- From: Shaozhong SHI <shishaozhong@gmail.com> Date: Mon, 4 Apr 2022 at 23:13 Subject: How to just get the last in a recursive query To: PostGIS Users Discussion <postgis-users@lists.osgeo.org>In this example, Network Walking in PostGIS · Paul Ramsey (cleverelephant.ca)3 rows got returns as follows: id --- 6 3 1 How to just get the last (namely, 1) in the most efficient way? Regards, Davidreverse the order of the last query and set limit 1
On 4/4/22 16:14, Shaozhong SHI wrote:---------- Forwarded message --------- From: Shaozhong SHI <shishaozhong@gmail.com> Date: Mon, 4 Apr 2022 at 23:13 Subject: How to just get the last in a recursive query To: PostGIS Users Discussion <postgis-users@lists.osgeo.org>In this example, Network Walking in PostGIS · Paul Ramsey (cleverelephant.ca)3 rows got returns as follows: id --- 6 3 1 How to just get the last (namely, 1) in the most efficient way? Regards, Davidreverse the order of the last query and set limit 1
---------- Forwarded message --------- From: Shaozhong SHI <shishaozhong@gmail.com> Date: Mon, 4 Apr 2022 at 23:13 Subject: How to just get the last in a recursive query To: PostGIS Users Discussion <postgis-users@lists.osgeo.org>In this example, Network Walking in PostGIS · Paul Ramsey (cleverelephant.ca)3 rows got returns as follows: id --- 6 3 1 How to just get the last (namely, 1) in the most efficient way? Regards, David
id --- 6 3 1
How to just get the last (namely, 1) in the most efficient way?
Regards, David
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