Anchor table
Database table that is the source for data in a projection.
Database table that is the source for data in a projection. The anchor table and its projection must be in the same schema. The privileges to create, access, or alter a projection are based on the anchor tables that the projection references, as well as the schemas that contain them.
In the following simple statement, public data is the anchor table:
=> CREATE PROJECTION publicdataproj AS (SELECT * FROM publicdata);