【多选题】【消耗次数：1】
当局部Ｅ-Ｒ图合并成全局Ｅ-Ｒ图时可能出现冲突，具体包括（ ）。
①
属性冲突
②
语法冲突
③
结构冲突
④
命名冲突
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在数据库概念结构设计中，各分E-R模型之间的冲突主要有：属性冲突、[填空]和结构冲突。
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