Despite having a brain no bigger than the tip of your index finger, pigeons have a very impressive visual memory.
尽管鸽子的大脑只有人的食指尖那么大，但它们的视觉记忆力却非常惊人。
No price index can be considered absolutely true; there are many plausible ways to select and put together the goods and services to measure.
没有任何一个物价指标是完全正确的.选择目标商品和服务价格并将它们放在一起来衡量的方法有很多.
Your data and the text index need to be explicitly synchronized if no update frequency is specified.
如果没有指定更新频率，那么需要显式地对数据和文本索引进行同步。
Note that after you create a text index, text search does not find any results, as the text index contains no data at this point.
注意，在创建文本索引之后，文本搜索还不能找到任何结果，因为此时文本索引不包含任何数据。
If you use this syntax to create an index on a table that other users are accessing, the index is not available until no user is updating the table.
如果使用这种语法在其他用户正访问的表上创建索引，那么只有当没有用户更新该表时，创建的索引才能使用。
There is usually no index or statistics information provided at the remote data source on a view.
远程数据源上通常不提供关于一个视图的索引或统计信息。
So many that, although each one is indexed very quickly, there is just no way to index them all without taking 30 minutes to do so.
数量如此之多以至于虽然每一个索引的建立速度都很快，但是要为所有的数据库和视图建立索引则必须花费30分钟。
Nearly half of hotels (46%) have seen their POPULARITY INDEX increase, slightly less (42%) report no change and 12% have seen their rank decline.
接近一半的酒店(46%)的排名有所上升，42%的酒店的排名轻微下降或是没有变化，而有12%的酒店的排名有所下降。
Sorting is required when no index satisfies the requested ordering of fetched rows, or the optimizer determines that a sort is less expensive than an index scan.
如果没有索引满足所取的行的要求顺序，或者优化器断定排序的代价低于索引扫描，那么就需要进行排序。
The optimizer normally chooses a table scan if no appropriate index has been created or if an index scan would be more costly.
如果没有创建合适的索引，或者如果索引扫描的成本更高一些，优化器通常就选择表扫描。
This join method is usually used when no index is available on the join columns for the joining tables.
当连接表的连接列上没有可用索引时，通常使用该连接方法。
While it may seem that the access plan in Figure 5 is simpler, it comes with a higher estimated execution cost because no index could be exploited to filter out non-qualifying rows.
虽然看上去图5中的访问计划更简单，但是它的预计执行成本更高，因为不能利用索引过滤不符合要求的行。
There is no FETCH or table node shown in the access path graph because it is an index-only scan.
因为其是一个唯一索引扫描，所以在访问路径图中不显示FETCH或表节点。
This library has no catalogue, and none of the books has an index or table of contents.
这个图书馆没有书本目录，每本书也没有索引或内容目录。
If weather conditions deteriorate, a panel of experts USES an index system to determine if crops will no longer be viable.
如果天气状况恶化，一个专家小组就使用索引系统来决定庄稼是否将存活下去。
With a very small example such as this one, the index can be close to as big as the example as if there were no duplicated words.
使用像本例这样非常小的示例，如果没有重复的单词，则索引的大小会十分接近示例的大小。
Correlated subqueries will greatly degrade the speed of data retrieval, especially for non-selective queries on huge tables with millions of rows and with no index.
相关子查询将极大地降低数据检索的速度，对于拥有几百万个行但没有索引的大型表的非选择性查询更是如此。
The reason for this is that the other tables in the DB2 UDB SAMPLE database have no primary key, and hence no index information to associate a unique ECO key with.
原因是DB2UDBSAMPLE数据库中的其他表没有主键，因此没有索引信息可以关联惟一的ECO 键。
Nic Marks, the head of NEF's centre for wellbeing, added: "It is clear that no single nation listed in the Happy Planet Index has got everything right."
{8}尼克·马克斯是新经济基金民生问题中心负责人，他补充说：“可以很清楚地看到，快乐星球指数所列的所有国家都没有恰当地处理好各方面的关系。”
Some operations like ALTER table require no cursor to be open, while others like CREATE INDEX ONLINE allow cursors on the table.
ALTERTABLE等一些操作要求不打开游标，而CREATEINDEXONLINE等其它操作则允许表上的游标。
If your Web site is just getting off the ground and no other site in the search index links to yours, the search engines haven't discovered it.
如果Web站点是刚刚建立的，而且在搜索索引中没有其他站点链接到它，那么搜索引擎还没有发现它。
If no custom document model is supplied as index parameter, Net Search Extender USES its default document model.
如果没有通过索引参数提供定制的文档模型，那么NetSearchExtender使用它的默认模型。
If the project has just been created, the Job doesn't accomplish much because there's no code to index.
如果刚创建了该项目，Job并没有多大功能，因为还没有可以索引的代码。
There is much less index access and no index AND'ing so that the overall performance can be one or two order of magnitude better - depending on predicate selectivity.
只有相当少的索引访问且没有索引AND'ing，这样整体性能将提高一个或两个数量级 ——取决于谓词选择。
If no index is found, then there are no cached tweets, so there is nothing to show and no optimization can be made on the query (and you return a value of 0 to indicate this).
如果没找到任何索引，那么就没有缓存的tweet，所以就没有展示的东西，并且没有可对查询进行的优化(您返回一个0值以指示这一点)。
The leftmost plan (a) is used if there is no eligible index for the predicates in this query.
如果该查询中没有合适的索引用于谓词，则使用最左边的计划(a)。
The truth is that no index is perfect (there is a long argument to be had about whether housing costs are properly measured in the core number as well).
事实是没有一项指标是完善的(关于住房成本在核心指数中的测量是否恰当存在着长期争论)。
An index scan can be non-matching, which means that there are no restrictions in the scan of the underlying index.
索引扫描可以是非匹配的，这意味着在基础索引的扫描上没有限制。
This means that you can perform these searches against a database owned by other people in which you have no ability to create views or a full-text index.
这意味着可以对其他人拥有的数据库执行这些搜索，而您是无法在该数据库中创建视图或全文索引的。
This means that you can perform these searches against a database owned by other people in which you have no ability to create views or a full-text index.
这意味着可以对其他人拥有的数据库执行这些搜索，而您是无法在该数据库中创建视图或全文索引的。
应用推荐