其實，這是一種規范，而不是一種規則。所以你使用駝峰來命名也是可以的，但是我們要避免用駝峰來命名。

不只是數據庫，就是平常的程序也是，因為：

MYSQL 5.7 FEATURES. THIS MANUAL DESCRIBES FEATURES THAT ARE NOT INCLUDED IN EVERY EDITION OF MYSQL 5.7; SUCH FEATURES MAY NOT BE INCLUDED IN THE EDITION OF MYSQL 5.7 LICENSED TO YOU. IF YOU HAVE ANY QUESTIONS ABOUT THE FEATURES INCLUDED IN YOUR EDITION OF MYSQL 5.7, REFER TO YOUR MYSQL 5.7 LICENSE AGREEMENT OR CONTACT YOUR ORACLE SALES REPRESENTATIVE.

你能一眼看出這段文字么？

MySQL 5.7 features. This manual describes features that are not included in every edition of MySQL 5.7; such features may not be included in the edition of MySQL 5.7 licensed to you. If you have any questions about the features included in your edition of MySQL 5.7, refer to your MySQL 5.7 license agreement or contact your Oracle sales representative.

人看習慣了一種規范，看到駝峰就要花腦力去解析的好么？不只是要你看得懂，后面維護的人也要看懂。

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