查找oracle中兩個表中不常見的行

Question

我有兩個包含以下值的表。

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

輸出應該如下：

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 
); 

OR :)

select field from tab1 
minus 
select field from tab2 

union all 

select field from tab2 
minus 
select field from tab1 

但是，BEST（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; 

對於上述查詢，請參閱此處的test。

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)