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
- locally flat manifold
- locally flat point
- locally flat structure
- locally flat submanifold
- locally flat transfer
- locally free group
- locally free module
- locally free sheaf
- locally gauge invariant Lagrangian for a gauge theory
- locally generated sheaf
- locally holonomic connection
- locally homeomorphic
- locally homogeneous space
- locally homomorphic function
- locally idempotent element
- locally integrable function
- locally isometric
- locally isomorphic
- locally isomorphic group
- locally linear embedding
- locally Macaulay ring
- locally modular space
- locally nilpotent algebra
- locally nilpotent group
- locally nilpotent ideal