合併2個子查詢

Question

我有兩個子查詢與兩個不同表中的相同列，我想用兩個子查詢中的行轉入視圖。

(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)) 

從這些2個查詢我想要與列「A」和「B」，與所有來自查詢結果的視圖。

這可能嗎？如果這是我該怎麼做？

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;