In this case, the ALLIO run for the first query was significantly faster than the FIRSTIO run in the time it took to return all 12 rows.
在这种情况下,对于第一个查询,与使用FIRSTIO优化目标相比,使用ALLIO时返回全部12行所需的时间明显更短。
In a similar vein, update the SearchErrorView to return an XML-encoded error message in case of an error in input validation or query execution.
以类似的方式更新SearchErrorView,以便在输入验证或查询执行中出现错误时返回一个XML编码的错误消息。
The SELECT clause specifies what the query should return — in this case, a variable named url.
select子句指定查询应当返回的内容,在这个例子中,返回的是名为url的变量。
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