How to identify change

Question

Hi All,
I have two table:
Table 1
Key1 Key2 Col3
1 10 A
1 10 B
Table 2
Key1 Key2 Col3
1 10 B
1 10 C
Based on Key 1 and Key 2, I need to identify Value A has been changed to value C in Col3. How can I do this?

Answer 1

Hi,
Can you be more clear about what you're trying to do?
Maybe you want something like this:
SELECT  NVL (t1.key1, t2.key1)     AS key1
,     NVL (t1.key2, t2.key2)     AS key2
,     t1.col3                     AS t1_col3
,     t2.col3               AS t2_col3
FROM           table_1  t1
FULL OUTER JOIN      table_2  t2  ON   t2.key1     = t1.key1
                              AND  t2.key2     = t1.key2
                     AND  t2.col3     = t1.col3
WHERE   t1.key1                        = t2.key1
AND     t1.key2                  = t2.key2
AND     LEAST (t1.col3, t2.col3)   IS NULL
I hope this answers your question.
If not, post a little sample data (CREATE TABLE and INSERT statements, relevant columns only) for all the tables involved, and the results you want from that data.
Explain, using specific examples, how you get those results from that data.
Always say what version of Oracle you're using (e.g. 11.2.0.2.0).
See the forum FAQ {message:id=9360002}
Edited by: Frank Kulash on Feb 23, 2013 8:52 AM
Your last message wasn't visible when I wrote the above. I see your desired results now.