plsqlvids01 plsqlvids01 <plsqlvids01@xxxxxxxxx> writes: > What is the use of postgres regclass datatype in user tables? When would > one want to use them when regular data types are available? If any tables > have these data types, since pg_upgrade would fail, what data types should > those be converted to? Indeed, storing reg* types in user tables isn't particularly recommended because of the pg_upgrade problem. However, casting to a reg* type is plenty useful in queries on the system catalogs. There is more info and examples in the manual: https://www.postgresql.org/docs/current/datatype-oid.html regards, tom lane
