标识符的长度没有限制。
在早期，编程工具受制于标识符的长度，故而注释成为了传达编程涵义的唯一选择。
In early days, your tool often had a limit on identifier character length that could be used so the comments were the only choice for delivering some meaning to other human beings.
DB 2Databasefor Linux,UNIX,andWindowsVersion 9.5开始支持长达128个字符的长标识符；之前，它只支持长度为18个字符的标识符。
DB2 Database for Linux, UNIX, and Windows Version 9.5 started supporting long identifiers up to 128 characters; previously it supported identifiers only 18 characters in length.
指定的标识符名称太长，请将其长度缩短到18个字符。
Identifier name specified is too long, you need to trim it down to 18 characters long.
指定的标识符名称太长，请将其长度缩短到18个字符。
Identifier name specified is too long, you need to trim it down to 18 characters long.
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