SSD7EXCISE5
ssd7-ex5ERModelsTheentitytypes(identifyweakentities).Theattributesineachentitytype(identifyitassingle-valued/multi-valued,derived,simple/composite,etc).Leavetheattributesoutofthediagram.Instead,listeachentityinatextualform,andbeneatheachone,listitsattributes.Therelationshiptypes(iden
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很详细，谢谢
不好意思 没看清楚 亲 你要是个积分...... 不过下载下来能用