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
- quotient object
- quotient of ideals
- quotient of language
- quotient of polynomials
- quotient of two numbers
- quotient orientation
- quotient polygon
- quotient relation
- quotient representation
- quotient ring
- quotient ring; factor ring
- quotient rule
- quotient semigroup
- quotient seminorm
- quotient sequence
- quotient set
- quotient sheaf
- quotient singularity
- quotient singular value decomposition
- quotient skew field
- quotient space
- quotient structure
- quotient subgroup
- quotient symbol
- quotient system