本文介绍如何利用Oracle PL/SQL中的dbms_lob.substr函数来提取CLOB字段中的部分内容。该函数接受三个参数：要操作的字段名、要转换的字符数量以及转换开始的位置。通过调整第二个参数可以控制提取的字符数量。
dbms_lob.substr can help you.
Tips & Warnings
The dbms_lob.substr function has three parameters: the field name, the number of characters you want to convert and the position from which the conversion begins. The expression, dbms_lob.substr( clob_field, 4000, 1 ) converts 4,000 characters of clob field beginning with the first. Use a smaller number in place of 4,000 if you want to convert fewer characters, and use a number larger than one to shift the starting point of the conversion.
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