Also, DB2 cannot use random order index columns as part of a sort merge join.

另外，DB 2无法在排序合并合并连接中使用随机顺序的索引列。

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Therefore, DB2 can use a DOUBLE index for faster join processing.

因此，DB 2可以使用DOUBLE索引用于快速连接处理。

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The overall cost depends on whether there is an index on the join columns.

总成本取决于连接列上是否有索引。

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The overall cost depends on whether there is an index on the join columns.

总成本取决于连接列上是否有索引。

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