[postgis-users] Merge all polygons from a dataset

[danny]

Hello everybody,

I've converted a shapefile of Europe to PostGIS. I would like to merge all
the countries together so that I only have one polygon left, the whole
contour of Europe. I have tried ST_Union that gives me no result. I've tried
several other functions to no avail. Does anybody know how I should proceed?

Many thanks,

Erik
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