数据库作业

在linux系统下的MySQL

创建数据库

使用数据库

查询当前默认的数据库以及使用的编码方式校验规则

查询创建数据的语句

删除数据库

创建数据表

定义多个字段,用上所有数据类型

mysql> SHOW CREATE TABLE multi_tb;
+----------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table    | Create Table                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
+----------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| multi_tb | CREATE TABLE `multi_tb` (
  `company_name` char(8) DEFAULT NULL COMMENT '公司名称',
  `introduce` varchar(100) DEFAULT NULL COMMENT '介绍',
  `content1` tinytext COMMENT '公司员工名',
  `content2` text COMMENT '内容1',
  `content3` mediumtext COMMENT '内容2',
  `content4` longtext COMMENT '内容3',
  `picture1` blob COMMENT '图片1',
  `picture2` mediumblob COMMENT '大图片',
  `picture3` longblob COMMENT '视频',
  `list` enum('X1','X2','X3') DEFAULT NULL COMMENT '选择列表',
  `list1` set('Y1','Y2','Y3','Y4') DEFAULT NULL COMMENT '公司的职业',
  `people1` tinyint DEFAULT NULL COMMENT '管理层人数',
  `area` smallint DEFAULT NULL COMMENT '公司面积',
  `gong_shu` mediumint DEFAULT NULL COMMENT '公司流动资金',
  `money` int DEFAULT NULL COMMENT '投资资金',
  `people2` bigint DEFAULT NULL COMMENT '公司员工编号',
  `wages` float(8,3) DEFAULT NULL COMMENT '平均工资',
  `wages_gong` double(10,2) DEFAULT NULL COMMENT '月营业额',
  `wages_nian` decimal(11,2) DEFAULT NULL COMMENT '年营业额',
  `date` date DEFAULT NULL COMMENT '日期',
  `datetime` datetime DEFAULT NULL COMMENT '日期加时间',
  `timestamp` timestamp NULL DEFAULT NULL COMMENT '时间戳',
  `time` time DEFAULT NULL COMMENT '时间',
  `year` year DEFAULT NULL COMMENT '年'
) ENGINE=InnoDB DEFAULT CHARSET=gbk |
+----------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)

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