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
- opencast survey
- open cavity
- open cavity, open resonator
- open cell
- Open Center for Citizen Activities Square
- open chain crater
- open channel
- open channel diversion
- open channel flow
- open channel flowmeter
- open channel hydraulics
- open channel spillway
- open circle
- open circuit
- open circuit hydraulic system
- open circuit potential
- open circuit voltage
- open-circuit voltage
- open-circuit voltage, OCV
- open circular DNA 开环
- open circulating water system
- open circulation theory
- OpenCL
- open-closed set
- open-closed supplementation and draining method