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Target columns in UPDATE ... SET must not be qualified with the target table; we disallow this because it'd create ambiguity about which name is the column name in case of field-qualified names. However, newbies have been seen to expect that they could qualify a target name just like other names. The error message when they do is confusing: "column "foo" of relation "foo" does not exist". To improve matters, issue a HINT if the invalid name is qualified and matches the relation's alias. James Coleman (editorialized a bit by me) Discussion: https://postgr.es/m/CAAaqYe8S2Qa060UV-YF5GoSd5PkEhLV94x-fEi3=TOtpaXCV+w@mail.gmail.com