1.varchar2 类型修改

例子：alter table T_Node modify (NODE_CONTEXT varchar2(4000));

2.varchar2 修改为clob

例子：

alter table T_Node add hehe clob; update T_Node set hehe=NODE_CONTEXT; alter table T_Node drop column NODE_CONTEXT; alter table T_Node rename column hehe to NODE_CONTEXT;

 

 

参考链接：

https://www.cnblogs.com/fx-blog/p/7133538.html

https://blog.csdn.net/cai7095576/article/details/23999549