St_Difference between raster and vector using PostGIS

[المشرف العام]

I want to calculate the difference between a raster and vector layer,

I used this querie but it's so slow and I don't know if it's right or not.

I'm not using st_difference because it only support vector layers

SELECT ST_Clip(a.raster,b.geom) FROM my_raster a, my_shape bWHERE not ST_Intersects(a.raster, b.geom)

could you please help me solve this problem?



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