Viewing results of ST_Difference

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I've got an ST_Difference query runnning error free in PostGIS, and in PGAdmin I can see the output table but it's not viewable in QGIS - The table name appears in DB Manager but says "There is no entry in Geometry Columns".

What do i need to do to view the results?

Here's my query:

DROP TABLE IF EXISTS processing.newdifference;CREATE TABLE processing.newdifference AS SELECT 1 AS gid, ST_Difference(tdhab.geom, tdbuf.geom) AS "diff_geom" FROM processing."tdhab", processing."tdbuf";Any pointers?



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