HTN20190109 https://blog.hatena.ne.jp/HTN20190109/ HTN20190109の日記 https://htn20190109.hatenablog.com/ DB Oracle (19c)drop table tab1 purge;create table tab1(col1 int);alter table tab1 add(col2 varchar2(10));alter table tab1 modify(col2 varchar2(100));alter table tab1 drop(col2); drop table tab2 purge;create table tab2(col1 int);alter table tab2 add(col2 varchar2(10),col3 varchar2(10));alter table tab2 … 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Fhtn20190109.hatenablog.com%2Fentry%2F2019%2F05%2F06%2F160515" title="カラム追加・変更・削除 - HTN20190109の日記" class="embed-card embed-blogcard" scrolling="no" frameborder="0" style="display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;"></iframe> Hatena Blog https://hatena.blog 2019-05-06 16:05:15 rich https://htn20190109.hatenablog.com/entry/2019/05/06/160515 1.0 100%