合并2个子查询

Question

我有两个子查询，它们来自两个不同的表中的相同列，我想将这些表转到包含两个子查询中的行的视图。

(SELECT one AS a, two AS b FROM table_a WHERE condition_a=true) 
(SELECT tree AS a, four AS b FROM table_b WHERE condition_b=true) 

( For the example lets assume that all data is VARCHAR(10) ) 

从这两个查询我想用“a”和“b”列创建一个视图，其中包含两个查询的所有结果。

这可能吗？如果是我怎么能这样做？。

Answer 1

使用union all：

create view v_ab as
    SELECT one AS a, two AS b FROM table_a WHERE condition_a=true
    union all
    SELECT tree AS a, four AS b FROM table_b WHERE condition_b=true;