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
- copper ion staining in situ
- copper isotope hydrogeology
- copper matte
- copper metallurgy
- copper mines at Rudna Glava
- Copper Mining and Metallurgical at Tongling
- Copper movable-type printing
- copper-nickel alloy
- copper nutrition
- copper ore resources
- copper oxide
- Copperplates of Imperial Edict on Unifying Weights and Measures of Qin Dynasty
- copper poisoning
- copper poisoning in animals
- Copper precious and prices devaluation
- copper pyrite
- copper red glaze
- copper-red porcelain
- copper rod upward continuous casting
- copper slab horizontal continuous casting
- copper sulfate
- copper sulfate pentahydrate
- copper sulfide
- copper-to-glass seal
- copper value