What is meant by the lossless join property in a relation schema? Is it the ability to maintain the semantics of information/data during the decomposition 开发者_JS百科of relations whilst normalising?
过期爱情 雨宗林 专辑：最美的时光 电视剧原声带 语种：国语 发行时间：2013-11-23
加载中,请稍侯......