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数据库 基础篇4（mysql语法---表）
5 表管理
选择数据库
5.1 查看所有表
mysql> show tables; +-----------------+ | Tables_in_day15 | +-----------------+ | student | +-----------------+ 1 row in set (0.00 sec) |
5.2 创建表
mysql> create table student( -> sid int, -> sname varchar(20), -> sage int -> ); Query OK, 0 rows affected (0.01 sec) |
5.3 查看表结构
mysql> desc student; +-------+-------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +-------+-------------+------+-----+---------+-------+ | sid | int(11) | YES | | NULL | | | sname | varchar(20) | YES | | NULL | | | sage | int(11) | YES | | NULL | | +-------+-------------+------+-----+---------+-------+ 3 rows in set (0.01 sec) |
5.4 删除表
mysql> drop table student; Query OK, 0 rows affected (0.01 sec) |
5.5 修改表
1）添加字段
mysql> alter table student add column sgender varchar(2); Query OK, 0 rows affected (0.03 sec) Records: 0 Duplicates: 0 Warnings: 0 |
2）删除字段
mysql> alter table student drop column sgender; Query OK, 0 rows affected (0.03 sec) Records: 0 Duplicates: 0 Warnings: 0 |
3）修改字段类型
mysql> alter table student modify column remark varchar(100); Query OK, 0 rows affected (0.07 sec) Records: 0 Duplicates: 0 Warnings: 0 |
4）修改字段名称
mysql> alter table student change column sgender gender varchar(2); Query OK, 0 rows affected (0.03 sec) Records: 0 Duplicates: 0 Warnings: 0 |
5）修改表名称
mysql> alter table student rename to teacher; Query OK, 0 rows affected (0.01 sec) |
数据库 基础篇4（mysql语法---表）