Managing exceptions in SQL

Question

Please assist with this little puzzle.
Imagine 2 tables... Products and Stock tables.
Products has columns:
Product_no
Site
Status
Stock has columns:
Product_no
Site
Location
Qty_on_hand
Sample data:
Products:
1000,MFG,A
1000,SRV,D
1000,DEM,A
1001,SRV,D
1001,DEM,O
1002,MFG,A
1002,DEM,A
1003,MFG,D
1003,SRV,D
1004,MFG,A
1005,MFG,D
1005,SRV,D
1005,DEM,D
1006,MFG,D
1007,MFG,D
1007,SRV,D
1008,MFG,D
1008,SRV,D
1009,MFG,D
And the Stock table:
1000,MFG,BAY1,1
1000,SRV,BAY1,0
1000,DEM,A,BAY2,0
1001,SRV,D,BAY1,0
1001,SRV,D,BAY2,0
1001,DEM,A,BAY1,0
1002,MFG,A,BAY1,0
1002,DEM,A,BAY2,0
1003,MFG,D,BAY1,0
1003,SRV,D,BAY1,0
1004,MFG,A,BAY1,0
1005,MFG,D,BAY1,0
1005,DEM,D,BAY1,0
1006,MFG,D,BAY1,0
1007,MFG,D,BAY1,5
1007,SRV,D,BAY1,100
1008,MFG,D,BAY1,1
1008,SRV,D,BAY1,0
So, a product can exist in multiple sites and can have a status of A(ctive), O(bsolete), D(iscontued) or P(lanned).
There may or may not be stock for the product, or even a row entry (eg 1009).
The stock table has the part which can be in multiple sites and each site has multiple locations.
The sum of qty on hand at product/site level gives the total qty on hand for that product/site, of course.
That is the background.
What I need to report is...
Product_no
Site
from Product
where
the product across all sites is D
and
the qty on hand across all sites is 0 (ie there isn't any)
So I think the results I would expect are:
1003,MFG
1003,SRV
1005,MFG
1005,SRV
1005,DEM
1006,MFG
1009,MFG
...BECAUSE
1000 has non-D status (2 actually)
1001 has non-D status
1002 has non-D status (2)
1003 are both D, sum qty on hand is 0, so OK
1004 has non-D status
1005 are all D, sum qty on hand is 0, so OK (one stock is missing, so assume 0)
1006 is D, sum qty on hand is 0 so OK
1007 are both D, sum qty on hand 105 so NOT OK
1008 are both D, sum qty on hand 1 so NOT OK
1009 is D and there is no stock, so assume 0 so OK
I can't seem to get my head around coding without using a multitude of double negatives! Any ideas, please?

Answer 1

Hello
It think this is right. Your test data for stock had the status column which I assumed to be a mistake....
CREATE TABLE dt_test_Products
Product_no     number,
Site     varchar2(3),
Status     varchar2(1)
create table dt_test_Stock(
Product_no     number,
Site     varchar2(3),
Location     varchar2(4),
Qty_on_hand     number
INSERT INTO dt_test_products VALUES(1000,'MFG','A');
INSERT INTO dt_test_products VALUES(1000,'SRV','D');
INSERT INTO dt_test_products VALUES(1000,'DEM','A');
INSERT INTO dt_test_products VALUES(1001,'SRV','D');
INSERT INTO dt_test_products VALUES(1001,'DEM','O');
INSERT INTO dt_test_products VALUES(1002,'MFG','A');
INSERT INTO dt_test_products VALUES(1002,'DEM','A');
INSERT INTO dt_test_products VALUES(1003,'MFG','D');
INSERT INTO dt_test_products VALUES(1003,'SRV','D');
INSERT INTO dt_test_products VALUES(1004,'MFG','A');
INSERT INTO dt_test_products VALUES(1005,'MFG','D');
INSERT INTO dt_test_products VALUES(1005,'SRV','D');
INSERT INTO dt_test_products VALUES(1005,'DEM','D');
INSERT INTO dt_test_products VALUES(1006,'MFG','D');
INSERT INTO dt_test_products VALUES(1007,'MFG','D');
INSERT INTO dt_test_products VALUES(1007,'SRV','D');
INSERT INTO dt_test_products VALUES(1008,'MFG','D');
INSERT INTO dt_test_products VALUES(1008,'SRV','D');
INSERT INTO dt_test_products VALUES(1009,'MFG','D');
INSERT INTO dt_test_stock VALUES(1000,'MFG','BAY1',1);
INSERT INTO dt_test_stock VALUES(1000,'SRV','BAY1',0);
INSERT INTO dt_test_stock VALUES(1000,'DEM','BAY2',0);
INSERT INTO dt_test_stock VALUES(1001,'SRV','BAY1',0);
INSERT INTO dt_test_stock VALUES(1001,'SRV','BAY2',0);
INSERT INTO dt_test_stock VALUES(1001,'DEM','BAY1',0);
INSERT INTO dt_test_stock VALUES(1002,'MFG','BAY1',0);
INSERT INTO dt_test_stock VALUES(1002,'DEM','BAY2',0);
INSERT INTO dt_test_stock VALUES(1003,'MFG','BAY1',0);
INSERT INTO dt_test_stock VALUES(1003,'SRV','BAY1',0);
INSERT INTO dt_test_stock VALUES(1004,'MFG','BAY1',0);
INSERT INTO dt_test_stock VALUES(1005,'MFG','BAY1',0);
INSERT INTO dt_test_stock VALUES(1005,'DEM','BAY1',0);
INSERT INTO dt_test_stock VALUES(1006,'MFG','BAY1',0);
INSERT INTO dt_test_stock VALUES(1007,'MFG','BAY1',5);
INSERT INTO dt_test_stock VALUES(1007,'SRV','BAY1',100);
INSERT INTO dt_test_stock VALUES(1008,'MFG','BAY1',1);
INSERT INTO dt_test_stock VALUES(1008,'SRV','BAY1',0);
SELECT
     product_no,
     site
FROM
     SELECT
          a.product_no,
          a.site,
          SUM(NVL(b.qty_on_hand,0)) OVER(PARTITION BY a.product_no ORDER BY a.product_no) prod_qty,
          COUNT(DECODE(a.status, 'D',NULL, 1)) OVER(PARTITION BY a.product_no ORDER BY a.product_no) stat_count
     FROM
          dt_test_products a,
          dt_test_stock b
     WHERE
          a.product_no = b.product_no (+)
     AND
          a.site = b.site (+)
WHERE
     prod_qty = 0
AND
     stat_count = 0 HTH
David