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I have published point file in geoserver from postgis table as store. I had huge data in my table(rows) and the data will keep udate daily (at least one point for one day). Now I want to show only the last 10 points added.

How do I restrict the data using Geoserver SLD Function?

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Personally, I would try to separate data store access/publishing from layer styling.
You could create a SQL View for the datastore, effectively adding a new layer with the query result table. The query will execute each time the layer is requested, the SLD style can be applied as usual.

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