If the index of the current letter is equal to the length of the string, this variable is an empty string.
如果当前字母的下标和字符串的长度相等，那么这个变量是一个空字符串。
Length of a string variable: Input argument for the SUBSTR function, which determines the desired length of the resulting string or output of the length function.
字符串变量的长度：substr函数的输入参数，决定了结果字符串的期望长度或length函数的输出。
The DB2_CLPPROMPT registry variable can be set to any text string up to a maximum of 100 characters in length.
DB 2 _ CLPPROMPT注册变量可以设置为任何文本字符串，最大长度为100个字符。
The Typeahead object stores the length of the string that the user entered in a variable called typedLength.
Typeahead对象存储了用户输入的被称为typedLength的字符长度。
The description column is a variable-length character string, so it expects a string (which you indicate by enclosing the character data within single quotes).
description列是长度可变的字符串，所以它预计是一个字符串(通过将字符数据括在单引号中指明)。
Variable-length character string having maximum length size bytes or characters.
具有最大长度的带有字符集属性的可变长度的字符类型。
Variable-length character string having maximum length size bytes or characters.
具有最大长度的带有字符集属性的可变长度的字符类型。
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