Can any one help with this query please

Question

I have a table something as below
Things_t
Things Characteristic Char Value
Item 1 Colour Red
Item 1 Packaging
Item 2 Shape Square
Item 2 Brand Spunk
Now i want to reterive an item with none of its char values as Null. Using the query “ select distinct things from things_t where char value is Null ” will fetch the item 1 also together with item 2. i want to fetch a record from thing for which none of the char values are Null such as Item 2. Can you please help me with this query.

Answer 1

Try this:
WITH t AS
(SELECT 1 item_id, 17436 chr_id, 14225034 chr_val_id FROM dual UNION
SELECT 1 item_id, 39 chr_id, 14276173 chr_val_id FROM dual UNION
SELECT 1 item_id, 17774 chr_id, NULL chr_val_id FROM dual UNION
SELECT 1 item_id, 265 chr_id, 20502978 chr_val_id FROM dual UNION
SELECT 1 item_id, 16978 chr_id, 797233 chr_val_id FROM dual UNION
SELECT 1 item_id, 13092 chr_id, 5666917 chr_val_id FROM dual UNION
SELECT 1 item_id, 15228 chr_id, 1209758 chr_val_id FROM dual UNION
SELECT 2 item_id, 112 chr_id,  12705342 chr_val_id FROM dual UNION
SELECT 2 item_id, 6945 chr_id, NULL chr_val_id FROM dual UNION
SELECT 2 item_id, 70 chr_id, 12597376 chr_val_id FROM dual UNION
SELECT 2 item_id, 16832 chr_id, NULL chr_val_id FROM dual UNION
SELECT 2 item_id, 7886 chr_id, 9588619 chr_val_id FROM dual UNION
SELECT 2 item_id, 6986 chr_id, 2659351 chr_val_id FROM dual UNION
SELECT 3 item_id, 9531 chr_id, 8910943 chr_val_id FROM dual UNION
SELECT 3 item_id, 9798 chr_id, 8717531 chr_val_id FROM dual UNION
SELECT 3 item_id, 17446 chr_id, 12266441 chr_val_id FROM dual UNION
SELECT 3 item_id, 4830 chr_id, 13683090 chr_val_id FROM dual UNION
SELECT 3 item_id, 9518 chr_id, 834772 chr_val_id FROM dual UNION
SELECT 3 item_id, 11031 chr_id, 20233753 chr_val_id FROM dual UNION
SELECT 3 item_id, 12564 chr_id, 2282478 chr_val_id FROM dual)
SELECT DISTINCT item_id
FROM   t
MINUS
SELECT DISTINCT item_id
FROM   t
WHERE  chr_val_id IS NULLOr this:
SELECT item_id
FROM  (SELECT   item_id,
                MIN(NVL(chr_val_id, -1)) min_chr_val_id
       FROM     t
       GROUP BY item_id)
WHERE  min_chr_val_id != -1Edited by: lee200 on Oct 15, 2012 9:22 AM