Of course, no index can account for everything.
当然，没有任何索引可以解释一切。
There is no index on customer_number in the bills table.
在账单表中不存在customer_number上的索引。
Properties cannot be displayed because no index was specified.
由于未指定索引，因此无法显示属性。
A query is often slow because it has no index or an inefficient index.
查询很慢，因为没有索引或者索引不足够。
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。
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。
Generally, using this index value is not required, and there is no index access to tables of all dependency properties.
通常并不需要使用这个索引值，而且不会存取所有相依性属性的任何表索引。
At present, there is no index and standard available for evaluating siltation degree of a harbor both at home and abroad.
关于港口泥沙回淤程度的评价指标与标准，国内、外目前尚无专著文献。
Although easily available and searchable on-line, the CFR 21 is a vast document covering a wide range of subjects but contains no index.
虽然容易得到，网上搜索，病死率21是一个巨大的文件，涵盖的学科范围广泛，但不包含索引。
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)。
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 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。
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。
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)。
If there is no index on ucname, the DBMS still does a full table scan, but it need not do any further processing on the data to determine whether or not it satisfies the query.
如果没有为ucname创建索引，DBMS仍然执行全表扫描，但是不会对数据进行进一步处理来判断其是否满足查询。
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。
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。
Every index in dicynone group had no significant difference from that in control group.
用止血药组与对照组之间的各项指标无显著差异。
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。
No physical index is built at the federated server on behalf of this nickname.
在联邦服务器上，不会建立代表该昵称的物理索引。
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。
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。
Dropping the index is deferred until no user is using the index.
索引的删除延迟到没有用户使用该索引的时候。
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。
There is no option to disable index support for an existing constraint.
对于一个现存约束，要禁用索引支持没有别的选择。
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。
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。
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