SQL数据库课件 The slides for Structed Query Language-SQL Database Courseware The slides for Structed Query Language

CBIR is retrieval of images based on some query or example images. It is also called Query based image retrieval. Firstly, this report outlines a descr iption of the primitive features of an image color and shape. These features are extracted and use

数据库连接查询leftjoin的优化使用，以及和子查询的对比，在不同的数量级上分别阐述用什么方式比较合适-Database connection the query optimization use leftjoin, and subqueries contrast, expounded in what way is more appropriate in a different order of magnitude