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
- image comparison
- image compression
- image construction
- image contour
- image conversion
- image converter
- image convertor
- image copy detection
- Image Creation of Library
- image curve
- image data
- image data acquisition
- image database
- image data model
- image deblurring
- image deconvolution
- image definition
- image degradation
- image derotator
- image description
- image detection
- image diameter
- image digitalization
- image digitization
- image discrete cosine transform，DCT