Each character is represented using a sequence of bits using a character encoding.
每个字符由一个使用字符编码的位序列表示。
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If a character in a particular encoding spans multiple bytes, the character-based string functions can process each character as a single unit as opposed to a sequence of bytes.
Prior to DB2 UDB V8.2, a Unicode database could only be defined with the collating sequence IDENTITY, which means that the characters are compared by their byte encoding.