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select topic from book b, share s, stall st where b.b#=s.b# and st.store#=s.store#
我正在尝试绘制查询树我不知道如何为上面的示例绘制查询树。
如果这是针对分布式数据库,您需要首先知道您的数据库是如何分布的,然后才能为其绘制查询树,即。垂直(列)和水平(值)分布