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Oracle 10g Outer Left Join issue

Posted on 2012-09-20
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Last Modified: 2012-09-20
Experts,

I have having issues with what should be a simple outer left join. Please comment what is wrong


Select H.Item_Code, H.Item_Des1, D.item_qty_bkd_qty
from M_item_H H
LEFT OUTER JOIN M_ITEM_D1 D on H.Item_code = D.Item_code
and H.cust_code = D.cust_code
and H.comp_code = D.comp_code
where D.item_qty_Bkd_lev_num = 2
and h.comp_Code = 'W1'
and h.Cust_Code = 'TIMWEB'

Expecting all records from H
and only matching from D, null otherwise

Current output is = and returns only values where
where D.item_qty_Bkd_lev_num = 2
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Question by:JDCam
  • 2
3 Comments
 
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Accepted Solution

by:
lwadwell earned 2000 total points
ID: 38417706
That is correct ... the left outer join returns null to the WHERE clause when no row is found.
The WHERE clause then cancels that by doing D.item_qty_Bkd_lev_num = 2

Use the D.item_qty_Bkd_lev_num = 2 in the ON e.g.
LEFT OUTER JOIN M_ITEM_D1 D on H.Item_code = D.Item_code
AND D.item_qty_Bkd_lev_num = 2
and H.cust_code = D.cust_code
and H.comp_code = D.comp_code
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LVL 25

Expert Comment

by:lwadwell
ID: 38417715
If D.item_qty_Bkd_lev_num is never null ... you could also do it the WHERE clause
WHERE (D.item_qty_Bkd_lev_num = 2 or D.item_qty_Bkd_lev_num IS NULL)
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Author Closing Comment

by:JDCam
ID: 38417819
Thanks
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