设计形式良好的循环嵌套和流程片断分支，将是降低出现建模错误的可能性的有效方式。
A well-formed nesting of cyclic and branching process fragments is a good approach to reduce the possibility of modeling errors.
因为嵌套循环联接的工作方式，所以每隔一个外部表记录执行第二步(共4个节点)。
Because of how nested loop joins work, the second leg (there are four nodes) is executed per outer table record.
因为嵌套循环联接的工作方式，所以每隔一个外部表记录执行第二步(共4个节点)。
Because of how nested loop joins work, the second leg (there are four nodes) is executed per outer table record.
应用推荐