Need Help With SQL GROUP BY and DISTINCT

Question

I am working on a project and need to display the total of each order based on the order id. For instance I want to display the order id, customer id, order date, and then the extension price (ol_quantity * inv_price).
I would then like a total displayed for order # 1 and then move on to order #2.
Here is my SQL code :
SELECT DISTINCT orders.o_id, customer.c_id, inv_price * ol_quantity
FROM orders, customer, inventory, order_line
GROUP BY orders.o_id, customer.c_id, inv_price, ol_quantity
ORDER BY orders.o_id;
When my code is run it displays the order id, customer id and inv_price * quantity (extension price) but no order total for the order number and a new group is not started when a new order number is started....they are all clumped together.
Any help is greatly appreciated!!

Answer 1

Hi,
user12036843 wrote:
I am working on a project and need to display the total of each order based on the order id. For instance I want to display the order id, customer id, order date, and then the extension price (ol_quantity * inv_price).
I would then like a total displayed for order # 1 and then move on to order #2.
Here is my SQL code :
SELECT DISTINCT orders.o_id, customer.c_id, inv_price * ol_quantity
FROM orders, customer, inventory, order_line
GROUP BY orders.o_id, customer.c_id, inv_price, ol_quantity
ORDER BY orders.o_id;
When my code is run it displays the order id, customer id and inv_price * quantity (extension price) but no order total for the order number and a new group is not started when a new order number is started....they are all clumped together.
Any help is greatly appreciated!!Sorry, it's unclear what you want.
Whenever you post a question, post a little sample data (CREATE TABLE and INSERT statements, relevant columns only), 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.
Do you want the output to contain one row for each row in the table, plus an extra row for each distinct order, showing something about the order as a whole (e.g., total inv_price or average extension_price)? If so, you need GROUP BY ROLLUP or GROUP BY GROUPING SETS .
If you want one row of output for each row of the table, but you want to include something that reflects the group as a whole (again, e.g, total inv_prive or average extension_pcie), then you can us analytic functions. (Most of the aggregate functions, such as SUM and AVG have analytic counterparts that can get the same results without collapsing the result set down to one row per group.)
Here's an example of how to use GROUP BY GROUPING SETS.
Way we're interested in employees' salary and commission from the scott.emp table:
SELECT       deptno
,       ename
,       sal
,       comm
FROM       scott.emp
ORDER BY  deptno
,            ename
;Output:
`   DEPTNO ENAME             SAL       COMM
        10 CLARK            2450
        10 KING             5000
        10 MILLER           1300
        20 ADAMS            1100
        20 FORD             3000
        20 JONES            2975
        20 SCOTT            3000
        20 SMITH             800
        30 ALLEN            1600        300
        30 BLAKE            2850
        30 JAMES             950
        30 MARTIN           1250       1400
        30 TURNER           1500          0
        30 WARD             1250        500Now say we want to add the total income (sal + comm, or just sal if there is no comm) to each row, and also to add a row for each department showing the total sal, comm and income in that department, like this:
`   DEPTNO ENAME             SAL       COMM     INCOME
        10 CLARK            2450                  2450
        10 KING             5000                  5000
        10 MILLER           1300                  1300
        10                  8750                  8750
        20 ADAMS            1100                  1100
        20 FORD             3000                  3000
        20 JONES            2975                  2975
        20 SCOTT            3000                  3000
        20 SMITH             800                   800
        20                 10875                 10875
        30 ALLEN            1600        300       1900
        30 BLAKE            2850                  2850
        30 JAMES             950                   950
        30 MARTIN           1250       1400       2650
        30 TURNER           1500          0       1500
        30 WARD             1250        500       1750
        30                  9400       2200      11600(This relies on the fact that ename is unique.) Getting those results is pretty easy, using GROUPING SETS:
SELECT       deptno
,       ename
,       SUM (sal)          AS sal
,       SUM (comm)          AS comm
,       SUM ( sal
           + NVL (comm, 0)
           )               AS income
FROM       scott.emp
GROUP BY  GROUPING SETS ( (deptno)
                         , (deptno, ename)
ORDER BY  deptno
,            ename
;Notice that we're displaying SUM (sal) on each row. Most of the rows in the output are "groups" consisting of only one row from the table, so the SUM (sa) for that goup will be the sal for the one row in the group.
Edited by: Frank Kulash on Nov 23, 2011 2:03 PM
Added GROUPING SET example