在选择查询的情况下，将返回描述结果集的对象。
In the case of a select query, objects representing ResultSets will be returned.
描述如何创建将两个或更多的select语句的结果合并到一个结果集的查询。
Describes how to create a query that merges the results of two or more SELECT statements into one result set.
描述如何创建将两个或更多的select语句的结果合并到一个结果集的查询。
Describes how to create a query that merges the results of two or more SELECT statements into one result set.
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