phpMyAdmin is a tool written in PHP intended to handle the administration
of MySQL over the Web. Currently it can create and drop databases, create/drop/alter tables,
delete/edit/add fields, execute any SQL statement, manage keys on fields.
--
Adminer http://sourceforge.net/projects/adminer/
Adminer (formerly phpMinAdmin) is a full-featured database management tool written in PHP.
Conversely to phpMyAdmin, it consist of a single file ready to deploy to the target server.
It is available for MySQL, PostgreSQL, SQLite, MS SQL and Oracle.