SQL statement by using the min aggregate function result extract a line - how?

Need help, try to do something seemingly simple. I'll give a simple example to illustrate the problem.

I'll use a simple table of addresses with 4 fields.

Create the table:
  CREATE TABLE "ADDRESSES" 
   (     "OWNER_NAME" VARCHAR2(20 BYTE), 
     "STREET_NAME" VARCHAR2(20 BYTE), 
     "STREET_NUMBER" NUMBER
   ) ;
complete with 6 rows
Insert into ADDRESSES (OWNER_NAME,STREET_NAME,STREET_NUMBER) values ('FRED','MAIN',1);
Insert into ADDRESSES (OWNER_NAME,STREET_NAME,STREET_NUMBER) values ('JOAN','MAIN',2);
Insert into ADDRESSES (OWNER_NAME,STREET_NAME,STREET_NUMBER) values ('JEAN','MAIN',3);
Insert into ADDRESSES (OWNER_NAME,STREET_NAME,STREET_NUMBER) values ('JACK','ELM',1);
Insert into ADDRESSES (OWNER_NAME,STREET_NAME,STREET_NUMBER) values ('JANE','ELM',2);
Insert into ADDRESSES (OWNER_NAME,STREET_NAME,STREET_NUMBER) values ('JEFF','ELM',3);
We now have this:
Select * from addresses
OWNER_NAME           STREET_NAME          STREET_NUMBER          
-------------------- -------------------- ---------------------- 
FRED                 MAIN                 1                      
JOAN                 MAIN                 2                      
JEAN                 MAIN                 3                      
JACK                 ELM                  1                      
JANE                 ELM                  2                      
JEFF                 ELM                  3                      

6 rows selected
Now, I want to group by street name and obtain a number of houses. At the same time, I would like to know the number of the first and the last House
    select
    street_name,
    count(*) "NBR HOUSES",
    min(street_number) "First Number",
    max(street_number) "Last Number"
     from addresses
    group by street_name

produces

STREET_NAME          NBR HOUSES             First Number           Last Number            
-------------------- ---------------------- ---------------------- ---------------------- 
ELM                  3                      1                      3                      
MAIN                 3                      1                      3                      

2 rows selected
Excellent. Now for the problem. I would also like to list on each line, the owner who lives at number House first and/or the last. It should be noted, assume that the name of the street and the number is unique

It seems I have everything that I need. Don't know how to get home.

I tried:
select
    street_name,
    count(*) "NBR HOUSES",
    min(street_number) "First Number",
    max(street_number) "Last Number",
    (Select b.owner_name from addresses b where b.street_number = min(street_number) and b.owner_name = owner_name) "First Owner"
     from addresses
    group by street_name
But getting a syntax error sql group function unauthorized when I add the subselect statement.

any ideas?

Thanks for any help.

Published by: user6876601 on November 19, 2009 19:08

Published by: user6876601 on November 19, 2009 19:30

Hello

Welcome to the forum!

Get the minimum and maximum number for each street is a pretty simple concept; simpler to describe and simple to code.
Now you want to the owner_name associate the maximum and minimum, which is a concept more complex; a little more difficult to describe and, unfortunately, much less simple to code and much, much more difficult to explain:

select
    street_name,
    count (*)                "NBR HOUSES",
    min (street_number)      "First Number",
    min (owner_name) KEEP (DENSE_RANK FIRST ORDER BY street_number)
                    "First Owner",
    max (street_number)      "Last Number",
    min (owner_name) KEEP (DENSE_RANK LAST ORDER BY street_number)
                    "Last Owner"
     from addresses
    group by street_name
;

You will notice that I used min for "Original owner" and "last owner". Why is this?
The key word in these functions is the FIRST or the LAST word that comes after DENSE_RANK and before ORDER BY. The function at the beginning is simply a break.

In other words, MIN in this context refers only to what needs to happen when there is a link to the first or last in the group. Even if such a thing is impossibe in your data, generic functions must have a mechanism to return a single owner_name when two or more rows have an equal right to having the highest street_number. For example, if we change the address of Joan in 1 hand, then MIN (street_number) is always 1, of course, but who is the person associated with the minimum street_number: Fred or Joan? Both have an equal claim that he owns with the smallest address on Main Street, but aggregate functions must return a single value, so we must have a mechanism to indicate to the system, whether to return 'JOAN' or 'FRED '. In this example, I arbitrarily in the network said een of tie, the lowest name, in alphabetical order, must be returned. In this case, 'FRED' would return, "FRED" prior to "JOAN".

Thank you for including CREATE TABLE and INSERT!

Tags: Database

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