说明：  这是MySQL参考手册。该文档的MySQL 5.0是5.0.64版本。MySQL是一个开放源码的小型关系数据库管理系统，开发者为瑞典MySQL AB公司。目前MySQL被广泛地应用在Internet上的中小型网站中。由于其体积小、速度快、总体拥有成本低，尤其是开放源码这一特点，许多中小型网站为了降低网站总体拥有成本而选择了MySQL作为网站数据库。
(This is the MySQL Reference Manual. It documents MySQL 5.0 through 5.0.64. MySQL is a small open-source relational database management system, developed for the Swedish company MySQL AB. MySQL is currently being widely used in the small and medium-sized Internet site. Because of its small size, speed and low total cost of ownership, in particular the characteristics of open source, many small and medium-sized Web sites in order to reduce the total cost of ownership and the choice of the MySQL database as a Web site.)