使用ALTER 来修改数据表表名或修改数据表字段名;
当我们需要修改数据表名或者修改数据表字段时,就需要使用到MySQL ALTER命令。
修改表名:alter table biao_a RENAME biao_b;
1.删除,添加或修改表字段
1)删除表字段->语法:alter table 表名 drop 字段名;
栗子:如下命令使用了 ALTER 命令及 DROP 子句来删除以上创建表的 i 字段:
mysql> ALTER TABLE testalter_tbl DROP i;
2)添加字段->语法:alter table add 字段 数据类型等;
栗子:实例在表 testalter_tbl 中添加 i 字段,并定义数据类型:
mysql> ALTER TABLE testalter_tbl ADD i INT;
2.修改字段类型及名称
1.modify 如果不修改字段名,只修改字段数据类型等,使用modify;
栗子:把字段 c 的类型从 CHAR(1) 改为 CHAR(10),可以执行以下命令:
mysql> ALTER TABLE testalter_tbl MODIFY c CHAR(10);
2.change 如果修改字段名称并且修改数据类型,则使用change;
栗子:语法有很大的不同。 在 CHANGE 关键字之后,紧跟着的是你要修改的字段名,然后指定新字段名及类型。
将my这张表的new字段修改为new_change
MySQL [mydb]> alter table my change new new_change int(5) not null default 0;
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