Choose to include all columns in the list.
选择包含清单中的所有栏目。
The optimizer will choose dynamic hash join if none of the joined columns has index.
如果连接列上不存在索引，那么优化器将选择动态哈希连接。
For partitioning indexes, it is recommended that you choose key columns that are unlikely to be changed.
对于分区索引，建议选择不大可能改变的键列。
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