"Luke Pascoe" <luke(dot)p(at)kmg(dot)co(dot)nz> writes:
> temp=> ALTER TABLE parent ADD CONSTRAINT ccc_nn CHECK (ccc IS NOT NULL);
> ERROR: cache lookup of attribute 3 in relation 70023 failed
What version did you say you were running? It works fine for me in 7.3.
I can believe this has been broken in the past, though.
regards, tom lane