cuug
发布时间:2014-04-30 11:25:50
1.将该列设置为null,再修改其类型(这样会丢失数据)2.最简单的方法: 假设你的表名为 tab_target create table test as select * from tab_target whre 1=2; alter table test modify (col_name number(5)); insert into test select * from tab_target; drop table tab_target;&nbs.........【阅读全文】