条件子句

For or when the condition becomes false, but not when the loop is terminated by a break statement.

循环可以有一个else 子句；它在循环迭代完整个列表或执行条件为false时执

This query retrieves the sum total of all marks for a particular student and it uses a condition in the where clause.

此查询检索某个学生的所有商标的总和，它使用在WHERE子句中的条件。

But with each update, in the where clause an extra condition is added that specifies the version of the object that was originally loaded.

但是对每次更新，一个额外的用来指定初始装载的对象的版本的条件会增加在 where 子句中。

Introduce Explaining Variable is particularly valuable with conditional logic in which it is useful to take each clause of a condition and explain what the condition means with a well-named temp.

Introduce Explaining Variable用来处理那种带有分支条件的逻辑特别有效，用一个取了个好名字的临时变量来代替每一个分支条件子句，变量的名字解释分支条件。

The optimization methods of database SQL query were studied and some available query optimization Methods were given out as follows: The incompatible data type should avoid to be used; More redundancy search parameters should be given as join condition in join query; In some condition, the number of note hitted to target was estimated by optimizing implement using the average density; Some other maths operating symbol should avoid to be used as condition parameters in WHERE clause; Some operating symbol and its sentence should avoid to be used also; When the cluster function was used,the WHERE clause should be paied attention to more,and so on.

作者单位：（重庆工学院商贸信息学院，重庆 400050）摘要：数据库SQL查询语句的优化，须注意：避免使用不兼容数据类型；连接查询中应多给连接条件提供一些冗余的搜索参数；某种条件下优化器只能使用其平均密度以估计命中的记录数；避免对WHERE子句中条件参数使用其它数学操作符；避免使用某些操作符及相应语句；聚簇函数的使用应注意WHERE子句。

The satisfiability of conjunction normal form is a typical NP-complete problem. To study the complexity of SAT problem, a new concept of saturated clause muster has been introduced with using the characteristic of saturated clause muster. The sufficient condition of SAT problem was approved to be a polynomial and has opened out essential distinction of 2SAT and 3SAT problems.

合取范式可满足性问题是典型的NP完全问题，本文引入了一个饱和子句集的新概念，利用饱和子句集的特性，研究了SAT问题的复杂性，证明了SAT问题复杂性为多项式的一个充分条件，并揭示了二元可满足性问题与三元可满足性问题的本质差别。

SELECT ProductID, Name FROM AdventureWorks2008R2.Production.Product WHERE Class ='H' ORDER BY ProductID

在 WHERE 和 HAVING 子句中的搜寻条件，也就是识别资格，可包含下列各项

When queried, table name corresponded to current data window was extracted, and sent it to GQM, query if-clause was extracted to reconstruct SQL script.

查询时，先提取当前数据窗口对应的表名，将其传给GQM，再提取GQM查询条件子句重构SQL脚本。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。