修改mysql數據庫表結構的方法：1、查看表結構；2、添加列；3、刪除列，代碼為【mysql> alter table student drop column birthday】；4、修改列，代碼為【mysql> alter table】。
本教程操作環境：windows7系統、mysql 8.0.22版、thinkpad t480電腦。
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修改mysql數據庫表結構的方法：
1、查看表結構
mysql>?show?create?table?student; +---------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ |?Table???|?Create?Table??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????| +---------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ |?student?|?CREATE?TABLE?`student`?( ??`ID`?int(11)?NOT?NULL?AUTO_INCREMENT, ??`NAME`?varchar(20)?NOT?NULL, ??`AGE`?int(11)?NOT?NULL, ??PRIMARY?KEY?(`ID`) )?ENGINE=InnoDB?AUTO_INCREMENT=13?DEFAULT?CHARSET=utf8?| +---------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ 1?row?in?set?(0.09?sec)
2、添加列
mysql>?alter?table?student?add?column?birthday?datetime; Query?OK,?0?rows?affected?(2.06?sec) Records:?0??Duplicates:?0??Warnings:?0
3、刪除列
mysql>?alter?table?student?drop?column?birthday; Query?OK,?0?rows?affected?(0.80?sec) Records:?0??Duplicates:?0??Warnings:?0
4、修改列
--1.修改列的類型 mysql>?alter?table?student?modify?age?int?not?null; Query?OK,?0?rows?affected?(0.09?sec) Records:?0??Duplicates:?0??Warnings:?0 ? --2.修改列的名稱 mysql>?alter?table?student?change?column?name?sname?varchar(20); Query?OK,?0?rows?affected?(1.31?sec) Records:?0??Duplicates:?0??Warnings:?0
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