equijoin

equijoin

1. Starting from the concept of minimal partial instances, we turn to extending the equijoin operator in total relations to the consistent join operator in partial relations.

从最小偏实例的概念出发,把全关系中的等值连接算子推广为偏关系中的相容连接算子。

2. outer equijoin

外部相等连接

3. In addition, hash, merge, and block-nested loop joins can only be used when an equijoin condition is present.

此外,只有当存在等值连接条件时,才可能使用散列、合并和块嵌套循环连接。

4. equijoin (equi-join)

等接

5. This query has no conjunctive equijoin condition; hence without detailed predicate analysis the optimizer would fail to discover an efficient access plan.

该查询不包含连接性等值连接条件;因此,如果不进行详细的谓语分析,优化程序将无法发现有效的访问计划。