Added updated roadmap to MySQL/PostgreSQL comparison (by Monty).

PostgreSQL currently offers the following advantages over MySQL Server:

Note that because we know the MySQL road map, we have included in the

following table the version when MySQL Server should support this feature.

Unfortunately we couldn't do this for previous comparison, because we

don't know the PostgreSQL roadmap.

@multitable @columnfractions .30 .30

@item @strong{Feature}                     @tab @strong{MySQL version}

@item Subselects                           @tab 4.1

@item Foreign keys                         @tab 4.1

@item Views                                @tab 5.0

@item Stored procedures                    @tab 5.0

@item Triggers                             @tab 5.0

@item Unions                               @tab 4.0

@item Full join                            @tab 4.1

@item Constraints                          @tab 4.1 or 5.0

@item Cursors                              @tab 4.1 or 5.0

@item R-trees                              @tab 4.1 (for MyISAM tables)

@item Inherited tables                     @tab Not planned

@item Extensible type system               @tab Not planned

@end multitable

Other reasons someone may consider for using PostgreSQL:

@itemize @bullet

@item

Standard usage in PostgreSQL is closer to ANSI SQL in some cases.