要检查位置是否有效，请登录到MySQL服务器中，查询文章表来看看纬度和经度字段填写得是否合适。
To check for valid locations, log into the MySQL server and query the articles table yourself to see if the lat and lon fields are filled in appropriately.
如果你想搜索图书馆藏书，却不知道作者的名字、书名或文章的确切名称，你必须设置关键字查询。
If you want to search the library holdings and don't know the author's name or the exact title of the book or an article, you have to set up a keyword search.
本系列后续文章将提供有关适用于查询调优方法的更多信息。
Future articles in this series will provide more information on methodologies that you can use for query tuning.
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