Reducing data on vector layer in Qgis

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I use Qgis for GIS. Lately I had just too many points appearing on my vector layer and I will want to reduce them (100 for a given scale : min-1 and max 9000). With labels it works quite well but how can this be done with the features on the vector layer in Qgis?I will need an expression to choose at random 100 points for the layer, that is if the query builder could do this.



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