I want to nullify fields which does not exist in reference table.
I tried
UPDATE demo.toode SET "liik"=NULL, "grupp"=NULL WHERE ("grupp", "liik") NOT IN
(SELECT("grupp", "liik") FROM "artliik")
but this causes error:
ERROR: operator does not exist: character = record
HINT: No operator matches the given name and argument type(s). You may need
to add explicit type casts.
How to write this UPDATE statement properly ?
