连接次序指示，强制优化器按照指定次序连接表。
Join order directives that force optimizer to join tables in the designated order.
目标指示，强制优化器使用指定的规则来返回查询结果。
Goal directives that force the optimizer to use the designated rules to return query results.
访问计划指示，强制优化器使用指定的访问方法进行数据检索，要么是连续扫描，要么是索引扫描。
Access plan directives that force the optimizer to use the designated access method for data retrieval, either sequential scan or index scan.
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