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我是OWB Dataware house builder的新手,我想了解SET运算符联合功能,联合功能是UNION还是UNION ALL?
简单联合意味着删除完全重复,而 UNION ALL 意味着所有行。
如果选择了 SET 运算符,您可以在属性编辑器中设置操作。
可能的操作是: