oracle - 在oracle中查找两个表中不常见的行

Question

我有两个具有以下值的表。

tab1              tab2
----              ----
A                   A
B                   E
C                   F
D                   G

输出应如下所示：

O/P
---
B
C
D
E
F
G

Answer 1

select field from tab1
union all
select field from tab2

minus

(select field from tab1
 intersect
 select field from tab2
);

或者 ：）

select field from tab1
minus
select field from tab2

union all

select field from tab2
minus
select field from tab1

但是，最好的（性能:)）：

select distinct nvl(a.field, b.field) as field
from tab1 a
full join tab2 b on (a.field=b.field)
where a.field is null or b.field is null;

请参阅此处对上述查询的测试。

Answer 2

select field from tab1 where field not in (select field from tab2) 
union 
select field from tab2 where field not in (select field from tab1)