mysql> select * from test; +------+--------+----------------------------------+------------+------------+------------+------------+ | t_id | t_name | t_password | t_birth | birth | birth1 | birth2 | +------+--------+----------------------------------+------------+------------+------------+------------+ | 1 | name1 | 12345678901234567890123456789012 | NULL | 1990-01-01 | 0000-00-00 | 2013-01-01 | | 2 | name2 | 12345678901234567890123456789012 | 2013-01-01 | NULL | 0000-00-00 | 2013-01-01 | +------+--------+----------------------------------+------------+------------+------------+------------+ 2 rows in set (0.00 sec)
執(zhí)行刪除命令,使用drop關(guān)鍵字。
基本的語法為:alter table
<表名> drop column <字段名>;
具體的命令如下:
mysql> alter table test drop column birth1; Query OK, 0 rows affected (0.13 sec) Records: 0 Duplicates: 0 Warnings: 0
看看刪除后的結(jié)果,是不是已經(jīng)沒有birth1字段了?
mysql> select * from test; +------+--------+----------------------------------+------------+------------+------------+ | t_id | t_name | t_password | t_birth | birth | birth2 | +------+--------+----------------------------------+------------+------------+------------+ | 1 | name1 | 12345678901234567890123456789012 | NULL | 1990-01-01 | 2013-01-01 | | 2 | name2 | 12345678901234567890123456789012 | 2013-01-01 | NULL | 2013-01-01 | +------+--------+----------------------------------+------------+------------+------------+ 2 rows in set (0.00 sec)
聲明:本網(wǎng)頁內(nèi)容旨在傳播知識(shí),若有侵權(quán)等問題請(qǐng)及時(shí)與本網(wǎng)聯(lián)系,我們將在第一時(shí)間刪除處理。TEL:177 7030 7066 E-MAIL:11247931@qq.com