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I have a table with some geometry types in and need to be able to return the SRID of a given field. How can I do this. I have had a search but all I can find is the function to alter a SRID. In Oracle I am doing this:
A.CLUSTER_EXTENT.SDO_SRID
Is there an equivalent function in PostGIS?
ST_SRID will give you the SRID of a single geometry.
Use Find_SRID for getting the SRID of a column.