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??????????????????漰?????????????????????????????????飬???????????????????????
??????????????????powerdesigner????????????飬???????′??μ???衣
??????????????DFD(Data Flow Diagram)
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???????????????CDM(Conceptual Data Model)
?????????????ER?????????????????????????????????塣?????????嶼?????????
???????????????PDM(Physical Data Model??
??????????????????????嵽????????????? ?????????????????????????????????????????????????????п?????忴?????????????????ε?????????????? ???????????????????????????????????????????????????????????????????????????????????????????ɡ?
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