用sql语句Mysql数据库的字段名？

Posted 2023-05-18

网上有很多，但是大部分都是错的。我想错的一个原因是大家互相抄袭，以讹传讹，嗨哟一个很大的原因是大家写的不标准。请回答时候尽量写标准些。
数据库类型： mysql
数据表名称： sheet1
原字段名：age char(10)
要修改成字段名：bir char(20)

请问怎么做？谢谢了，在线==
用sql语句修改mysql数据库字段名，当然不是删除后再建的那个，而是保留原数据，更新实现的方法。

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http://bbs.topsage.com/dispbbs.asp?boardID=122&ID=152162 参考技术A alter sheef1 set age char(10) where bir char(20)
试试吧 不敢肯定 呵呵本回答被提问者采纳 参考技术B sql server2000下是这样的

exec sp_rename 'sheet1.age','bir', 'COLUMN'
然后再
alter table sheet1 alter colunm bir char(20)

我说的是微软的sql2000下的办法，至于mysql我不大清楚

mysql我想添加一个字段，然后将这个字段和原表中的字段一起作为联合主键，应该怎么写SQL语句，正确再发答案

添加字段的语句应该类似ALTER TABLE tbl ADD COLUMNS (字段名 数据类型...);
如果没有主键，那就可以ALTER TABLE tbl ADD PRIMARY KEY(....);
至于有的话，我也不太清楚了。

我本机没有数据库，上面的是凭印象写出来的，不对勿怪…… 参考技术A ALTER TABLE 表名 ADD 字段名 类型( 长度 ) NOT NULL

ALTER TABLE 表名 DROP PRIMARY KEY ,
ADD PRIMARY KEY ( 字段名1 , 字段名2 )追问

这样如果原来表里的主键没有作为其它表的外键是可以,但是如果要DROP的主键又作为其它表的外键好像就不行了吧!

本回答被提问者采纳