连接计划指示，强制优化器使用指定的连接方法来连接查询中的表，要么是嵌套循环连接、分类合并连接，要么是动态哈希连接。

Join plan directives that force optimizer to use the designated join method to join tables in the query, either nested loop join, sort merge join, or dynamic hash join.

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一般来说，如果内部索引是良好的集群且预测内部表被多次探测，则使用复合排序的嵌套循环联将受到优化器的青睐。

In general, a nested loop join with sort composite is favored by the optimizer if the inner index is well-clustered and the inner table is expected to be probed many times.

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因此，在图7中优化器选择排序嵌套循环联接的复合物。

Therefore, in Figure 7 the optimizer chooses to sort the composite for the nested loop join.

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如果满足下列条件，优化器将选择嵌套循环连接。

The optimizer will choose nested-loop joins if.

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如果满足下列条件，优化器将选择嵌套循环连接。

The optimizer will choose nested-loop joins if.

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