5.1 基本概念 5.2 从ER图到关系模型设计的转换 5.3 从IDEF1x图到关系模型设计的转换 5.4 从ODL设计到关系模型设计的转换 5.5 本章小结

9.1 概述 9.2 简单查询语句 9.3 高级查询语句 9.4 数据库更新语句 9.5 数据定义语句 9.6 递归查询 9.7 动手练习 9.8 本章小结

11.1 概述 11.2 索引技术 11.3 散列技术 11.4 Microsoft SQL Server系统中的索引 11.5 本章小结

主要内容 13.1事务 13.2并发控制 13.3 Microsoft SQL Server系统的事务和锁 13.4本章小结

15.1 概述 15.2 数据挖掘和数据中心库 15.3 数据仓库的支持工具 15.4 数据仓库的实现步骤 15.5 数据的粒度、分割和元数据 15.6 本章小结

1、考虑图1所示关系数据库。对于下述查询中的每一个,给出一个关系代数表达式

源语言 词法分析 语法分析 前端

Handout written by maggie Johnson and revised by me Three address code Three-address code(tac) will be the intermediate representation used in our Decaf compiler. It is

Semantic analysis Parsing only verifies that the program consists of tokens arranged in a syntactically-valid combination, we now move on to semantic analysis, where we delve deeper to check whether they form a sensible set of instructions in the programming language

TAC Three address code Three-address code (tac) will be the intermediate representation used in our Decaf compiler. It is essentially a generic assembly language that falls in the lower-end of the mid-level IRs. Many compilers use an IR similar to TAC. It is a sequence of instructions, each of which can have at