数据库原理第三章

数学与计算机科学学院软件工程系数据库系统概论 An Introduction to Database System 第三章关系数据库标准语言 SQL ( 续 2 ）

第三章关系数据库标准语言 SQL ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

3.4 数据更新 ,[object Object],[object Object],[object Object]

3.4.1 插入数据 ,[object Object],[object Object],[object Object]

1. 插入单个元组 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

插入单个元组（续） ,[object Object],[object Object],[object Object],[object Object],[object Object]

插入单个元组（续） ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

2. 插入子查询结果 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

插入子查询结果（续） ,[object Object],[object Object],[object Object],[object Object],[object Object]

插入子查询结果（续） ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

插入子查询结果（续） ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

插入子查询结果（续） ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

3.4.2 修改数据 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

修改数据（续） ,[object Object],[object Object],[object Object],[object Object]

1. 修改某一个元组的值 ,[object Object],[object Object],[object Object],[object Object]

2. 修改多个元组的值 ,[object Object],[object Object],[object Object]

修改多个元组的值 ( 续 ) ,[object Object],[object Object],[object Object],[object Object]

3. 带子查询的修改语句 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

修改数据（续） ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

修改数据（续） ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

3.4.3 删除数据 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

删除数据（续） ,[object Object],[object Object],[object Object],[object Object]

1. 删除某一个元组的值 ,[object Object],[object Object],[object Object],[object Object]

2. 删除多个元组的值 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

3. 带子查询的删除语句 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

删除数据 ( 续 ) ,[object Object],[object Object],[object Object],[object Object],[object Object]

更新数据与数据一致性 ,[object Object],[object Object],[object Object],[object Object]

3.5 视图 ,[object Object],[object Object],[object Object],[object Object]

3.5 视图 ,[object Object],[object Object],[object Object],[object Object],[object Object]

1. 建立视图 ,[object Object],[object Object],[object Object],[object Object],[object Object]

建立视图（续） ,[object Object],[object Object],[object Object],[object Object],[object Object]

组成视图的属性列名 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

行列子集视图 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

建立视图（续） ,[object Object],[object Object],[object Object],[object Object]

WITH CHECK OPTION 的视图 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

对 IS_Student 视图的更新操作 ,[object Object],[object Object],[object Object],[object Object],[object Object]

基于多个基表的视图 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

基于视图的视图 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

带表达式的视图 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

建立分组视图 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

建立视图（续） ,[object Object],[object Object]

建立视图（续） ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

建立视图（续） ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

常见的视图形式 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

2. 删除视图 ,[object Object],[object Object],[object Object],[object Object]

删除视图 ( 续） ,[object Object],[object Object]

3.5.2 查询视图 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],new

查询视图（续） ,[object Object],[object Object],[object Object],[object Object]

查询视图（续） ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

查询视图（续） ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

查询视图（续） ,[object Object],[object Object],[object Object],[object Object],[object Object]

查询视图（续） ,[object Object],[object Object]

查询转换 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

3.5.3 更新视图 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

更新视图（续） ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

更新视图（续） ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

更新视图的限制 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

更新视图（续） ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

视图的可更新性 ,[object Object],[object Object],[object Object]

实际系统对视图更新的限制 ,[object Object],[object Object],[object Object],[object Object],[object Object]

更新视图（续） ,[object Object],[object Object],[object Object],[object Object],[object Object]

1. 视图能够简化用户的操作 ,[object Object],[object Object],[object Object],[object Object],[object Object]

2. 视图使用户能以多种角度看待同一数据 ,[object Object]

3. 视图对重构数据库提供了一定程度的逻辑独立性 ,[object Object],[object Object],[object Object],[object Object],[object Object]

3. 视图对重构数据库提供了一定程度的逻辑独立性 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

3. 视图对重构数据库提供了一定程度的逻辑独立性 ,[object Object],[object Object],[object Object],[object Object]

4. 视图能够对机密数据提供安全保护 ,[object Object],[object Object]

建立视图（续） ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],new

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数据库原理第三章

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