UNION 查询现在由查询设计器进行格式设置。
如果包含该列的表尚未添加，则查询设计器将该表添加到查询中。
If the table containing that column has not already been added, the query Designer adds it to the query.
因此，当使用UNION查询时，查询设计器将隐藏“表操作”窗格。
Therefore, when you are working with a UNION query, query Designer hides the Table Operations pane.
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