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  3. May 2021

RE: Need Help with SQL

Give this a shot.
It might not be correct - but it seemed to work with a table in our database.

with groupcount as (select ColumnA, ColumnB, ColumnC, ColumnD, count(*) thecount
from theFILE
group by ColumnA, ColumnB, ColumnC, ColumnD)
select z.ColumnA, z.ColumnB, z.ColumnC, y.ColumnD
from (select ColumnA, ColumnB, ColumnC
from theFILE
group by ColumnA, ColumnB, ColumnC ) z
join (select ColumnA, ColumnB, ColumnC , ColumnD
from groupcount gc2
where thecount = (select max(thecount)
from groupcount gc3
where (gc3.ColumnA, gc3.ColumnB, gc3.ColumnC) = (gc2.ColumnA, gc2.ColumnB, gc2.ColumnC)
group by gc3.ColumnA, gc3.ColumnB, gc3.ColumnC
fetch first 1 rows only)) y
on z.ColumnA = y.ColumnA
and z.ColumnB = y.ColumnB
and z.ColumnC = y.ColumnC


-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxxxxxxxx] On Behalf Of Vinay Gavankar
Sent: Wednesday, May 5, 2021 9:29 AM
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxxxxxxxx>
Subject: Re: Need Help with SQL

Correct.

On Wed, May 5, 2021 at 8:35 AM Therrien, Paul via MIDRANGE-L < midrange-l@xxxxxxxxxxxxxxxxxx> wrote:

I don't have an answer.... just trying to decipher the requirement:

You are asking for a result set that shows for any set of values for
A, B, & C; show the value in Column 4 of the value that occurs most
often in column 4? And you want distinct A, B, & C values so that you
only see, as in your example, either A1, B1, C1, D2 or A1, B1, C1, D4, but not both.

Data:
Frog, Giraffe, Lion, Ocelot
Frog, Giraffe, Lion, Cat
Frog, Giraffe, Lion, Dog
Frog, Giraffe, Lion, Cat
Frog, Giraffe, Lion, Ocelot
Tiger, Giraffe, Lion, Owl
Tiger, Giraffe, Lion, Owl
Frog, Bison, Lion, Ocelot
Frog, Bison, Lion, Armadillo
Frog, Bison, Lion, Cat

Result would be:
Either one of these:
Frog, Giraffe, Lion, Cat
Frog, Giraffe, Lion, Ocelot
(You would not want to see: Frog, Giraffe, Lion, Dog)

This one:
Tiger, Giraffe, Lion, Owl

Either one of these three:
Frog, Bison, Lion, Ocelot
Frog, Bison, Lion, Armadillo
Frog, Bison, Lion, Cat

-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxxxxxxxx] On
Behalf Of Vinay Gavankar
Sent: Tuesday, May 4, 2021 6:57 PM
To: Midrange Systems Technical Discussion
<midrange-l@xxxxxxxxxxxxxxxxxx>
Subject: Need Help with SQL

Hi,
I need some help with sql.
My table has 4 fields: A, B, C, D
I need my output to be grouped by A, B, C and a value of D which
occurs maximum number of times (if more than one value occurs same
number of times, any of those values is fine).
So if my records are:
A1, B1, C1, D1
A1, B1, C1, D2
A1, B1, C1, D2
A1, B1, C1, D3
A1, B1, C1, D4
A1, B1, C1, D4
A2, B1, C2, D1
My output should be:
A1, B1, C1, D2 or it can be A1, B1, C1, D4 A2, B1, C2, D1

This would be a one time process on about a million records so
performance is not an issue and it need not be a single sql.

TIA
Vinay
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