If the join key is a composite key, each key column must be prefixed with the PRIOR operator.
如果联接键是一个复合键，那么必须使用PRIOR运算符为每个键所在的列加上前缀。
The composite operation of fuzzy relation and operator constitute the fuzzy mapping.
模糊关系与算子合成构成了模糊映射，即将模糊集映射为模糊集。
Finally it is proved that P_-PBNDC is consistent with SBSPNI, and P_-PBNDC has composite property on the restriction and prefix operator but not on the parallel operator.
最后，证明了P - PBNDC和SBSPNI性质的一致性，在限制算子和前缀算子下的P - PBNDC具有复合性质，而在并行算子下不具有复合性质。
A second kind of operator is one that ACTS on component data elements instead of on the entire composite value.
第二种操作符是针对组成数据元素而非整个复合值的一种操作。
A second kind of operator is one that ACTS on component data elements instead of on the entire composite value.
第二种操作符是针对组成数据元素而非整个复合值的一种操作。
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