桌子上放着两本书 » Two books on the table 国内跟国外相比,一日三餐没什么不同 » Compared with domestic and abroad, on a little different from 3 meals ..
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There are two books on the table.
桌子上有两本书。
There are some flowers, three pencils and two books on the table.
桌子上有些花,三支铅笔和两本书。
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。
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