RE: Real life SQL Brain teaser

I would try....

Select
min(customer) combination,
type,
code
from
mytable
group by
type,
code
order by
min(customer),
type,
code;


-----Original Message-----
From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of Dave
Sent: Wednesday, November 18, 2020 1:08 PM
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxxxxxxxx>
Subject: [EXTERNAL] Real life SQL Brain teaser

Hi,



Before I start writing a program, I was wondering if SQL could offer an easier solution. I've been looking at using rank and over functions, but I can't see it! :

In my table below there are 4 customers but only 3 distinct combinations of Type and Code.

Customer Type Code

1 T1 C1

1 T1 C2

2 T2 C3

2 T2 C4

3 T5 C1

4 T1 C1

4 T1 C2

From this table, can I create the following table that contains each combination of Type and Code only once ?

combination Type Code

1 T1 C1

1 T1 C2

2 T2 C3

2 T2 C4

3 T5 C1



TIA !
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