1.根据上述语义画出ER图
J0(U6%~)N[~D5ZC`UHGAY]L.png
2将ER模型转换成数据表，并指出每个数据表的主键
![~]`SQSUHSQWOAN0H2$B1{NU.png](https://img.haomeiwen.com/i11121211/47294d9339261b3b.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
J0(U6%~)N[~D5ZC`UHGAY]L.png
![~]`SQSUHSQWOAN0H2$B1{NU.png](https://img.haomeiwen.com/i11121211/47294d9339261b3b.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
本文标题：2018-04-19
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