DB 2 9中基于字符的字符串函数。
还了解了代码单元和基于字符的函数的概念。
You also learned about the concept of code units and character-based functions.
如果参数是基于字符的输入参数，那么在单引号中指定字面值。
If the parameter is a character-based input parameter, then you would specify the literal value surrounded in single quotes.
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