This section describes how to write literal values in MySQL. 本节介绍如何在MySQL中编写文本值。These include strings, numbers, hexadecimal and bit values, boolean values, and NULL. 其中包括字符串、数字、十六进制和位值、布尔值和NULL。The section also covers various nuances that you may encounter when dealing with these basic types in MySQL.本节还介绍了在MySQL中处理这些基本类型时可能遇到的各种细微差别。