http://blog.sos.be/articles/2007/02/05/conceptual-model-of-the-mysql-information_schema en-us 40 <p>In MySQL (&gt;= 5.0) there exists a metadata database, <span class="caps">INFORMATION</span>_SCHEMA, in wich is stored information about all other databases, their tables, columntypes, accessprivileges, etc.</p><p>In addition to the <code>show</code> commands, the <code>select ... from information_schema....</code> offers the possibility of nearly unlimited output variations in querying the metadata.</p> <p><span class="caps">INFORMATION</span>_SCHEMA is a special kind of database, there is no database directory of that name, and some tables are in fact views, and it is also read-only. But you can connect to it with the <code>use</code> statement.</p> <p><a href="http://rpbouman.blogspot.com/">Roland Bouman</a> created an interesting <a href="http://www.xcdsql.org/MySQL/information_schema/5.1/MySQL_5_1_INFORMATION_SCHEMA.html">diagram</a> of the <span class="caps">INFORMATION</span>_SCHEMA database;</p> <p><a href="http://dev.mysql.com/doc/refman/5.0/en/information-schema.html">See Also the MySQL reference Manual</a></p> Mon, 05 Feb 2007 16:00:00 +0100 urn:uuid:e63dc589-01e7-4f1e-aead-263363cb3ed9 Paul Verreth http://blog.sos.be/articles/2007/02/05/conceptual-model-of-the-mysql-information_schema artikels