Group by Vs Partition By Clause

Question

Hello,
Can you please help me in resolving the below issue,
I have explained the scenario below with dummy table,
CREATE TABLE emp (empno NUMBER(12), ename VARCHAR2(10), deptno NUMBER(12));
INSERT INTO emp
(empno, ename, deptno
VALUES (1, 'A', 10
INSERT INTO emp
(empno, ename, deptno
VALUES (2, 'B', 10
INSERT INTO emp
(empno, ename, deptno
VALUES (3, 'C', 20
INSERT INTO emp
(empno, ename, deptno
VALUES (4, 'D', 20
INSERT INTO emp
(empno, ename, deptno
VALUES (5, 'E', 30
COMMIT ;
SELECT DISTINCT deptno, SUM (empno) / SUM (empno) OVER (PARTITION BY deptno)
FROM emp
GROUP BY deptno;
ORA-00979: not a GROUP BY expression
Earlier i had the query like
SELECT DISTINCT deptno, SUM (empno) OVER (PARTITION BY deptno,empno) / SUM (empno) OVER (PARTITION BY deptno)
FROM emp;
which executed successfully with wrong result.
Please guide me how to resolve this issue,
Thanks,
Santhosh

Answer 1

Hi,
santhosh.shivaram wrote:
Hello all, sorry for the providing the limited data, I have now depicting the actual data set and the current select query which is giving error and desired output. Please let me know if you need further information on this.
/* Formatted on 2012/09/14 08:00 (Formatter Plus v4.8.8) */ ...If you're going to the trouble of formatting the data, post it inside \ tags, so that this site won't remove the formatting.  See the forum FAQ {message:id=9360002}
**Current query:**
SELECT rep_date, cnty, loc, component_code,
SUM (volume) / SUM (volume) OVER (PARTITION BY rep_date, cnty, loc)This is the same problem you had before, and was explained in the first answer {message:id=10573091}  Don't you read the replies you get?SUM (volume) OVER (PARTITION BY rep_date, cnty, loc)
can't be used in this GROUP BY query, because it depends on volume, and volume isn't one of the GROUP BY expressions.
FROM table1
GROUP BY rep_date, cnty, loc, component_code;
when execute this query i am getting "ORA-00979: not a GROUP BY expression" error
My desired output_Formatting is especially important for the output.  Which do you think is easier to read and understand: what you posted:
Rep_Date     Cnty     Loc     Component_Code     QTY_VOL
9/12/2012     2     1     CONTRACT      -0.019000516
9/12/2012     2     1     CONTRACT      -0.019000516
9/12/2012     2     1     NON-CONTRACT      -0.893525112
9/12/2012     2     1     NON-CONTRACT      -0.89322
9/12/2012     2     1     CONTRACT-INDEX     1.912525629
9/12/2012     2     1     CONTRACT-INDEX     1.912526
9/12/2012     2     1     CONTRACT-INDEX     1.912526
9/12/2012     2     4     CONTRACT     0.015197825
9/12/2012     2     4     CONTRACT     0.015198
9/12/2012     2     4     NON-CONTRACT     0.984802175
9/12/2012     2     4     NON-CONTRACT     0.984802or this?Rep_Date     Cnty     Loc     Component_Code     QTY_VOL
9/12/2012     2     1     CONTRACT -0.019000516
9/12/2012     2     1     CONTRACT -0.019000516
9/12/2012     2     1     NON-CONTRACT      -0.893525112
9/12/2012     2     1     NON-CONTRACT      -0.89322
9/12/2012     2     1     CONTRACT-INDEX     1.912525629
9/12/2012     2     1     CONTRACT-INDEX     1.912526
9/12/2012     2     1     CONTRACT-INDEX     1.912526
9/12/2012     2     4     CONTRACT     0.015197825
9/12/2012     2     4     CONTRACT     0.015198
9/12/2012     2     4     NON-CONTRACT     0.984802175
9/12/2012     2     4     NON-CONTRACT     0.984802
Which do you think will lead to more answers?  Quicker answers?  Better answers?
Please let me know if you need any more information.Explain the results.
How do you compute the qty_vol column?  Give a couple of very specific examples, showing step by step how you calculate the values given from the sample data.
What does each row of the output represent? Your query says
GROUP BY rep_date, cnty, loc, component_code;which means the result set will have 1 row for each distinct combiation of rep_date, cnty, loc and component_code, but your desired output has at least 2 rows for every distinct combination of them, and in one case you want 3 rows with the same rep_date, cnty, loc and component_code.  How do you decide when you want 2 rows, and when you need 3?  Will there be occassions when you need 4 row, or 5, or 1?
All the rows with the same rep_date, cnty, loc and component_code have *nearly* the same qty_vol, but usually not quite the same.  Sometimes qty_col is rounded: sometimes it's changed slightly, but not just rounded (-0.893525112 get converted to -0.89322).  How do you decide when it's rounded, when it remains the same, and when it's changed to a completely different number?  When it's rounded, how do you decide how many digits to round it to?
Edited by: Frank Kulash on Sep 14, 2012 12:44 AM