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
- infrared imaging guidance
- infrared imaging homing guidance
- infrared imaging spectroscopy
- infrared index
- infrared inhibition of nozzle flow
- infra-red inspection
- infrared interference filter
- infrared interferometer
- infrared interferometry
- infrared jammer
- infrared jamming countermeasures
- infrared laser
- infrared laser chemistry
- infrared laser semi-active combined guidance
- infrared lens
- infrared light sensor
- infrared light source
- infrared line scanner
- infrared luminosity
- infrared magnitude
- infrared measuring distance
- infrared microscope
- infrared microscopy
- infrared millimeter wave radar combined guidance
- infrared modulation