PostGIS: intersection of a polygon with 2 rasters

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I'm trying to get the intersection of a Polygon with 2 raster layers in PostGIS.

The rasters have the same size and pixel size and I'd like to retrieve for the polygon a list of something like that:

1; 2
1; 2
1; 3
2; 2
...

Where each line is a pixel intersected by the polygon in both layers and the values is a combination of the pixel value from raster 1 and the pixel value from raster 2.

I don't really know what kind of request I have to do to achieve that...



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