This paper describes how to model select operation for relational database using UML dynamic modeling.
本文阐述如何使用统一建模语言动态建模方法为关系数据库的查询操作建模。
TS (Trace Selections) produces a message each time a stylesheet directive performs a select operation to retrieve data from the source document.
TS(跟踪选择，Trace Selection)，每当样式表伪指令执行select操作以从源文档检索数据时就生成一条消息。
Objective:To study the change of acetabular anteversion in developmental dysplasia of hip, in order to select operation type and suppose the prognosis.
目的：研究发育性髋关节脱位髋臼前倾角的变化，为手术选择和判断预后提供依据。
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