Postgresql 多个表的并集，每个表都有一个唯一的列

我有许多带有数据值的表。它们都有许多相同的列，但每个列都有一个唯一的列：

TableA = id, value, source, destination_a
TableB = id, value, source, destination_b
TableC = id, value, source, destination_c
TableD = id, value, source, destination_d
...

我想创建所有这些数据的视图，例如：

TableV = id, value, source, destination_a, destination_b, destination_c, destination_d

其中，如果不是来自该表，则每行的目的地_X为空

我已尝试手动为列设置空值，例如，仅使用上述两个表：

CREATE VIEW TableV AS
SELECT id, value, source, destination_a NULL AS destination_b FROM TableA UNION
SELECT id, value, source, destination_b NULL AS destination_a FROM TableB

但这会留下一列完全空白

如何创建一个表，它是所有这些表的并集，但包含所有N列并适当地为空

TableV | id | value | source | destination_a | destination_b
         a0    a1      a2      a3              NULL
         b1    b2      b3      NULL            b4

---

我不确定这是否适用于PostgresSQL，但对于SQL Server，我认为类似这样的东西会起作用：

CREATE VIEW TableV AS
SELECT id, value, source, destination_a as [A],NULL as [B],NULL as [C], NULL as [D]
    FROM TableA UNION
SELECT id, value, source, NULL as [A],destination_b  as [B],NULL as [C], NULL as [D]
    FROM TableB UNION
SELECT id, value, source, NULL as [A],NULL as [B],destination_c  as [C], NULL as [D]
    FROM TableC UNION
SELECT id, value, source, NULL as [A],NULL as [B],NULL as [C], destination_d as [D]
    FROM TableD 

---

好的，这里的问题只是我是如何订购SELECT的。我本应该：

CREATE VIEW TableV AS
SELECT id, value, source, destination_a NULL AS destination_b FROM TableA UNION
SELECT id, value, source, NULL AS destination_a, destination_b FROM TableB

我把空值作为。。。在每次选择的末尾