理学 数据库系统 释 query optimization 查询优化 查询优化旨在通过选择有效策略，对给定的关系表达式求值，使得查询代价最小。
数据库 数据库管理系统及其实现技术 释文 query optimization 查询优化
- commercial intelligence
- commercialization of dyes
- commercial law
- commercial law in continental law system
- commercial law of Anglo-American law system
- commercial law of France
- commercial law of Germany
- commercial law of Japan
- commercial law of middle ages
- commercial location
- commercial location theory
- commercial map
- commercial medical insurance
- commercial network
- commercial office building
- commercial off-the-shelf
- commercial paper
- commercial paper market
- commercial photography
- commercial poster
- commercial precedent
- commercial presence
- commercial property insurance
- commercial radio and television
- commercial registration