短語詞組短語derived relational algebra operators 關系代數(shù)的派生算子original relational algebra operators 原始算子See Relational Operators 見關系運算符supports relational operators 支持關系操作符Relational and Logical Operators 關系和邏輯運算符Relational and equality operators 關系運算子Boolean and relational operators 布爾和關系操作符;布爾操作和關系操作Relational Operators Relational Operators 關系運算子 返回 relational operator