What's missing?
There are a few very powerful features ANSI SQL provides that we haven't
mentioned, and that we won't go into detail on.
The main excu.. ahem, reason for this is that they're quite powerful and
complex and thus out of scope for this manual. Furthermore, they're
not supported by all SQL servers. MySQL in particular doesn't support them.
The features we're talking about here are views and sub-queries. When your
SQL server of choice supports them, Pike and Roxen WebServer can use them.
Also, SQL is designed to support transactions via some special
keywords. However, not all servers implement this feature. If you need
transactions, you also need an experienced database administrator to
optimize your SQL and your application in general, so you won't find any
reference to that here. Sometimes used as a simpler scheme in place of
transactions, table locking is available for instance on MySQL. Refer to
the MySQL manual for further information on the topic.
