... expressions, and Oracle Expression Filter, the latter two of which arenew to Oracle Database 10g.Note: Because regular expressions and Oracle Expression Filter are new to Oracle Database 10g, ... alike, is taken for granted. Basic . In Oracle SQL, a basic expression is really only a string, avalue, a column, or perhaps a sequence reference within a SELECTstatement list. For example, ... right and from top to bottom. The SQL parser willnot understand what to do with an attempt to pass a column alias frombottom to top and will produce a syntax (SQL parse) error. A subquery isparsed...