DataBase_2019_Spring issues

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题目答案是否出错

关于第一次作业第二大题的第一小题 1. 给出由 LODON(伦敦)的厂商供给 LODON 的工程的产品号。 ![image-20210225122440764](https://gitee.com/kevinzhang1999/my-picture/raw/master/uPic/image-20210225122440764-1614227080873.png) ![image-20210225122505686](https://gitee.com/kevinzhang1999/my-picture/raw/master/uPic/image-20210225122505686-1614227105800.png) `ΠSNO,PNO(SPJ)÷ΠSNO(σCITY=LONDON(S))` 这里是否漏掉了供给 London 的条件

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