可以很方便地利用清单7中展示的explain输出来描述其细节，可以对源表进行顺序扫描，并且在目标表上完成索引查找。
It is easier to describe this in detail using the explain output shown in Listing 7. Sequential scan is done on the source table, and index look-up is done on the target table.
可以很方便地利用清单7中展示的explain输出来描述其细节，可以对源表进行顺序扫描，并且在目标表上完成索引查找。
It is easier to describe this in detail using the explain output shown in Listing 7. Sequential scan is done on the source table, and index look-up is done on the target table.
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