SQLServer-----Union,Union All的使用方法

转载:

http://blog.csdn.net/kiqinie/article/details/8132485
select a.Name from Material as a
union 
select b.Name from Province as b
Union:将两个(多个)表的查询结果合并显示
Union All:将两个(多个)表的查询结果合并显示(不包括重复)
原文地址:https://www.cnblogs.com/tianhengblogs/p/6228294.html