怎樣才能真正加入例子？

Question

我有沒有產生預期的結果，下面的查詢：

SELECT "invoice"."ITEMNO", 
    "invoice"."Outgoing", 
    "storeage"."incoming" 
FROM "MVXJDTAP"."MVXJDTA"."invoice" 
INNER JOIN "MVXJDTAP"."MVXJDTA"."storeage " 
    ON "invoice"."ITEMNO" = "storeage"."itemno" 
ORDER BY"storeage"."itemno" 

Tables: 
invoice 
itemno  Outgoing 
ZOMV3-94  4 
ZOMV3-94  7 

storeage 
itemno  incoming 
ZOMV3-94 3 
ZOMV3-94 1 
ZOMV3-94 60 
ZOMV3-94 5 

查詢給出結果：

itemno  outgoing  incoming 
ZOMV3-94  4    3 
ZOMV3-94  4    1 
ZOMV3-94  4    60 
ZOMV3-94  4    5 
ZOMV3-94  7    3 
ZOMV3-94  7    1 
ZOMV3-94  7    60 
ZOMV3-94  7    5 

但我希望得到以下結果爲TRUE：

ZOMV3-94  4   NULL OR 0 
ZOMV3-94  7   NULL OR 0 
ZOMV3-94  NULL OR 0  3 
ZOMV3-94  NULL OR 0  1 
ZOMV3-94  NULL OR 0  60 
ZOMV3-94  NULL OR 0  5 

我怎樣才能得到這個結果？

Answer 1

您可以使用UNION ALL代替JOIN得到結果：

select itemno, 
    outgoing, 
    null as incoming 
from invoice 
union all 
select itemno, 
    null, 
    incoming 
from storeage; 

見SQL Fiddle with Demo。這給出了一個結果：

| ITEMNO | OUTGOING | INCOMING | 
---------------------------------- 
| ZOMV3-94 |  4 | (null) | 
| ZOMV3-94 |  7 | (null) | 
| ZOMV3-94 | (null) |  3 | 
| ZOMV3-94 | (null) |  1 | 
| ZOMV3-94 | (null) |  60 | 
| ZOMV3-94 | (null) |  5 |