Displays the names of specified schemas. If you do not specify an
    alias as part of a schema name, SQL displays schema information
    for all the attached databases. For each database that is not
    multischema, SQL displays the message, "No schemas found". For
    each multischema database, SQL displays the alias, followed by a
    list of schemas contained in that database. Each schema name in
    the list is preceded by the catalog and alias names.