Since this query contains no value predicate to restrict either the books or the authors table, DB2 has to perform a table scan on either of the two tables to read all author IDs.
由于该查询没有包含用来限制books或authors表的值谓词，因此DB 2必须在两个表上执行表扫描，以便读取所有author ID。
You can also restrict the posts by author.
你也可以根据作者限制文章数目。
In the part of how to restrict the recall right, the author select a bona fide and the right to recover a securious interest in conflict with the two perspectives are discussed.
在取回权行使的限制因素的论述中，选取了第三人的善意取得和担保物权与保留所有权相冲突这两个角度进行论述。
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