例如,需要多次执行,但每次执行只产生少量 的查询结果的聚合查询(aggregation queries)适合使用存储数据库模型下的一次性查询; 而连接查询(join queries)往往只需要执行一次,但执行一次需要很长时间,并且产生持续 ...
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聚合查询 Aggregation ; aggregate query ; koostekysely ; ag GREgate query
联合查询 union query ; union select ; samenvoegquery
组合查询 combination query ; Query Composition
合查询网 chaxun
复合查询 compound query
联合查询的关键字 ALL
综合查询 Integrated Query ; Integrative Query ; comprehensive query
条件组合查询 Select By Attributes
常量不能用查询表达式进行初始化,因为常量只能用文本、命名常量和数学运算符的某一组合进行初始化。
Constants cannot be initialized with query expressions because constants may only be initialized with some combination of literals, named constants, and mathematical operators.
LINQ中的集合作业指的是让查询作业根据同一集合或不同集合内是否有对等项目来传回结果集。
Set operations in LINQ refer to query operations that produce a result set that is based on the presence or absence of equivalent elements within the same or separate collections (or sets).
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