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
- auxiliary variable
- auxillary differential equation method
- auxin
- auxiometer
- auxis thazard
- Aux matter
- auxochrome
- auxochrome group
- auxoflorence
- auxograph
- auxotroph
- Auyuittuq National Park
- Auzout
- AV
- avadana
- Ava Dynasty
- availability
- availability and serviceability
- availability blowdown ratio
- availability factor
- availability factor of vehicle
- availability heuristics
- availability model
- availability of feed mineral elements
- availability of nuclear power plant