Specifies the default schema name for an SQL user session in
    dynamically prepared and executed or interactive SQL statements
    until another SET SCHEMA statement is issued.

    Within one multischema database, tables in different schemas can
    be used in a single SQL statement; tables in schemas in different
    databases cannot. If you omit the schema name when you specify
    an object in a multischema database, SQL uses the default schema
    name.