短語詞組短語relational algebra expression 關系代數表達式;算式safe relational calculus expression 安全關連式縯算陳式basic relational expression 基本關系式theoretical and relational expression 理論關系式character relational expression 字符關連表式value of relational expression [計]關系表達式值a relational expression 建立關系式calculation relational expression 計算關系式 返回 relational expression