If no columns satisfy the requirement for a default partitioning key, the table is created without one, which means the table cannot span more than one partition.
如果没有列能满足作为默认分区键的条件，则表在创建后就没有分区键，也就意味着这个表不能横跨一个以上的分区。
There are spaces above, but it is all cantilevered with no columns.
上面有空间，但均是悬挑的无柱结构。
There are spaces above, but it is all cantilevered with no columns.
上面有空间，但均是悬挑的无柱结构。
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