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to support enumeration of qualifiers, owners, and table types, the following special semantics for the qualifier, owner, name, and table_type are available:
to support enumeration of qualifiers, owners, and table types, the following special semantics for the qualifier, owner, name, and table_type are available:

if qualifier is a single percent character (%) and owner and name are empty strings, then the result set contains a list of valid qualifiers for the data source. (all columns except the table_qualifier column contain nulls.)
if owner is a single percent character (%) and qualifier and name are empty strings, then the result set contains a list of valid owners for the data source. (all columns except the table_owner column contain nulls.)