查询优化器根据从每个表检索的行数估计查询成本。
The query optimizer bases query-cost estimates on the number of rows to be retrieved from each table.
估计您每天能编写一个数据库访问类并完成其单元测试，因此，150 个表要用 150天的时间。
You estimate a day to write each database access class and unit test it, so 150 tables at one table per day is 150 days.
根据当时的市场估计，雷曼兄弟的资产负债表受到的冲击来自大约250亿美元的不流动资产的未实现损失。
According to market estimates at the time, Lehman’s balance-sheet was under pressure from perhaps $25 billion of unrealised losses on illiquid assets.
为了更好地解释说明基数估计值的提高，撤销除主键索引外的所有employee表上的现有索引。
To better illustrate the improvement in cardinality estimation, drop all the existing indexes on the EMPLOYEE table except the primary key index.
用表基数（560,273条记录）与谓词过滤因子 (0.0014%) 相乘就获得了 QUALIFIED_ROWS的估计值。
The estimate for QUALIFIED_ROWS is obtained by multiplying the table cardinality (560,273 records) by the predicate filter factor (0.0014%).
此外，由于中国很多采购是用现金付款，不计入表内，很多经济学家认为消费在官方估计的数据中被严重低估。
What's more, because many purchases in China are made in cash and off the books, many economists believe that consumption is severely under-counted in official estimates.
针对FMEA分析表中失效影响存在较大模糊性而难以有效估计的特点，引入模糊评估方法来进行分析。
Because failure effects in the FMEA analysis table are ambiguous and difficult to effectively estimate, Fuzzy evaluation method is proposed.
表视图支持行高的自动尺寸，并使用自定义估计高度。
The table view supports auto dimension for row height and uses custom estimated height.
目的系统讨论三维不完备表的独立性估计和检验方法。
Objective To discuss methods on estimation and test of independent incomplete three-dimensional contingency table.
通过每一单位血液传播疾病频数的最新估计在表1中列出。
Recent estimates of the frequency of disease transmission by a single unit of blood are shown in Table 1.
这个故事完整的日期事件表像呼啸山庄年鉴表一样，使用的日期是从小说中估计出来的。
A full, day-by-date timeline of the story is available as the Wuthering Heights Almanack, using dates estimated from the novel.
估计完成填写申请表的时间在15分钟以内。
Estimated time needed for completing the application is 15 minutes or less.
最适肥料用量和最大施肥量以及经济效益估计值列于表8。
The most suitable amount of fertilizer and maximum amount of K application and the estimation of economic benefit was listed in Table 8.
表1中列出了不同条件下适宜沟长的估计值。
Table 1 contains estimates of the appropriate lengths of rows for various conditions.
根据表中的资料可以计算出这个分组资料平均数的一个估计值。
From the information in this table, we can easily compute an estimate of the value of the mean of this grouped data.
如果覆盖率是通过产品的整个生命周期内测量的话，估计剩余需要做的测试的量会更加容易，反过来这又让日程表变得可以预测。
If coverage is measured throughout the lifecycle of the product, it is easier to estimate the amount of testing that remains to be done, which in turn helps to make the schedule predictable.
查询表46包括预定的多个均衡器滤波器长度，其对应于不同的确定或估计的延迟范围或另一选择度量。
A lookup table 46 includes a predetermined plurality of equalizer filter lengths corresponding to different determined or estimated delay spans or another selected metric.
对生命表法和乘积限估计法应用上的特点进行了比较，同时还对特殊的寿命数据类型——截断数据做了简要介绍。
Comparisons are made on the features of the life table Method and the Product-Limit Estimation in life table constructing procedure. A special type of life data, the truncated data, is introduced.
与 QUALIFIED_ROWS相关的数代表将使基础表引用的所有本地谓词合格的估计的记录数量。
The number associated with QUALIFIED_ROWS represents the estimated number of records that would qualify all the local predicates of the underlying table reference.
实验结果表明，提出的估计量化表算法复杂度小，精度高。
Simulation results show that the quantization table estimation algorithm proposed is less time consuming and of higher precision.
这也许是个极端的例子，但佩恩表的编制者估计所有撒哈拉以南的43个非洲国家的数据误差高达30- 40%。
This may be an extreme case but the PWT reckons that data for all 43 sub-Saharan African countries have margins of error of 30-40%.
当时我们正在飞机上，大约有两个小时的空闲时间。我本来估计过一遍乘法表可能需要20分钟。
We were on a plane and had about two hours to kill. I figured running through the twos to the twelves would take about 20 minutes.
自动表重组不会考虑那些表大小估计值大于大小条件的表。
Tables whose estimated size is greater than the size criteria are not considered by automatic table reorganization.
每个表引用的右边是表基数(依据记录的数量和页面的数量)以及合格行的估计数量。
To the right of each table reference is the table cardinality (in terms of both number of records and number of pages) and the estimated number of qualified rows.
他拒绝为撤军设定一个时间表。他说，撤军数量将取决于伊拉克的地面局势，但伊拉克的地面局势是无法提前作出估计的。
He has refused to agree to a timetable for withdrawals, saying reductions in troop levels will be determined by conditions on the ground in Iraq that are impossible to predict in advance.
瑞士信贷的分析师们估计，英国的银行从6月份开始就已经增加了其资产负债表的规模。
Analysts at Credit Suisse reckon that British Banks have increased their balance-sheets since June.
如果语句涉及到更大的表格和两个或者更多个表的连接的话，查询访问计划就很可能会因为基数估计值的提高而改变。
Statements involving larger tables and joins of two or more tables are more likely to exhibit a change in query access plan as a result of the improved cardinality estimate.
如果语句涉及到更大的表格和两个或者更多个表的连接的话，查询访问计划就很可能会因为基数估计值的提高而改变。
Statements involving larger tables and joins of two or more tables are more likely to exhibit a change in query access plan as a result of the improved cardinality estimate.
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