使用MySQL建表1

mysql> create table libraryMenu (
    -> BookName varchar(30) comment '书名',
    -> Author varchar(20) comment '作者',
    -> Price decimal(12, 4) comment '价格',
    -> BookType varchar(20) comment '类别'
    -> );
Query OK, 0 rows affected (0.37 sec)

mysql> show tables;
+-------------------+
| Tables_in_library |
+-------------------+
| librarymenu       |
+-------------------+
1 row in set (0.08 sec)

mysql> desc librarymenu
    -> ;
+----------+---------------+------+-----+---------+-------+
| Field    | Type          | Null | Key | Default | Extra |
+----------+---------------+------+-----+---------+-------+
| BookName | varchar(30)   | YES  |     | NULL    |       |
| Author   | varchar(20)   | YES  |     | NULL    |       |
| Price    | decimal(12,4) | YES  |     | NULL    |       |
| BookType | varchar(20)   | YES  |     | NULL    |       |
+----------+---------------+------+-----+---------+-------+
4 rows in set (0.12 sec)

mysql> alter table librarymenu rename library_menu;
Query OK, 0 rows affected (0.18 sec)

mysql> show tables;
+-------------------+
| Tables_in_library |
+-------------------+
| library_menu      |
+-------------------+
1 row in set (0.00 sec)

mysql> desc library_menu;
+----------+---------------+------+-----+---------+-------+
| Field    | Type          | Null | Key | Default | Extra |
+----------+---------------+------+-----+---------+-------+
| BookName | varchar(30)   | YES  |     | NULL    |       |
| Author   | varchar(20)   | YES  |     | NULL    |       |
| Price    | decimal(12,4) | YES  |     | NULL    |       |
| BookType | varchar(20)   | YES  |     | NULL    |       |
+----------+---------------+------+-----+---------+-------+
4 rows in set (0.00 sec)

mysql>