如何选择两个唯一字段的结果并显示为一列结果？

Question

我有两个字段包含和排除，我想在它们中提取唯一数据并将结果显示为一列结果。 例如，包含和排除具有相同的可能值，如午餐，晚餐，无线网络。结果应该是这样的， excludesAndIncludes （排除和包括的独特结果） ..................... 午餐 晚餐 无线上网 等

Answer 1

您可以使用union：

select excludes as excludesAndIncludes from t
union
select includes from t;

Answer 2

你可以写这样的查询：

select DISTINCT x.excludesAndIncludes from
(select DISTINCT excludes as excludesAndIncludes from t
union
select DISTINCT includes as excludesAndIncludes from t) as x;