However, if no indexes are available, the query optimizer must use a table scan.
但如果没有索引，则查询优化器必须扫描表。
Another way to influence the optimizer is to use query directives.
影响优化器的另一种方式就是使用查询命令。
A query access plan similar to the following is chosen by the optimizer.
优化器会选择类似如下所示的查询访问计划。
A query access plan similar to the following is chosen by the optimizer.
优化器会选择类似如下所示的查询访问计划。
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