Max Of SQL

Question

on 11G
I have a simple problem, but for some reason, probably been doing too many things today, it is not working... here is some sample data on 1 customer_id that is a duplicate and I need Max of to pick 1 row - on the most recent Date.
customer_id number
store number
date varchar2(100) represents MMYYYY (Month/Year)
111123432         111         042011
111123432         234         112010So I transpose that in my SQL so that it comes out as YYYYMM, since the TO_DATE field wants more data and I don't know that or fully understand how to use this, clients just wants it fast and dirty, so that's what I am planning to do.
The query that I need is to pick 1 row for the duplicate, based on the Date field, the most recent Date [please no smart remarks that I should convert that to a Real Date, client WANTS it like that!!! and they pay the bills $$$ :- ) ] they do not want a real date field.
so I though that this would be simple:
select customer_id, store, MAX (SUBSTR(DATE,3,4) || SUBSTR(DATE,1,2) ) as YYYYDD
from Table
where cust_id=111123432
Group by cust_id, store;
I end up with the 2 rows, and not the 1 that I need.
What am I doing wrong ?

Answer 1

Kodiak_Seattle wrote:
on 11G
I have a simple problem, but for some reason, probably been doing too many things today, it is not working... here is some sample data on 1 customer_id that is a duplicate and I need Max of to pick 1 row - on the most recent Date.
customer_id number
store number
date varchar2(100) represents MMYYYY (Month/Year)
111123432         111         042011
111123432         234         112010So I transpose that in my SQL so that it comes out as YYYYMM, since the TO_DATE field wants more data and I don't know that or fully understand how to use this, clients just wants it fast and dirty, so that's what I am planning to do.
The query that I need is to pick 1 row for the duplicate, based on the Date field, the most recent Date [please no smart remarks that I should convert that to a Real Date, client WANTS it like that!!! and they pay the bills $$$ :- ) ] they do not want a real date field.
so I though that this would be simple:
select customer_id, store, MAX (SUBSTR(DATE,3,4) || SUBSTR(DATE,1,2) ) as YYYYDD
from Table
where cust_id=111123432
Group by cust_id, store;
I end up with the 2 rows, and not the 1 that I need.
What am I doing wrong ?MAX() function need to be in WHERE clause