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  3. December 2019

Re: Help with SQL

Thanks guys. That worked fine.

The problem was my pitiable ignorance that the Status could be specified on
the JOIN clause. I thought that the Join fields need to be present in both
tables.

I would still appreciate any performance pointers, if any.

Vinay

On Fri, Dec 20, 2019 at 8:29 AM Rob Berendt <rob@xxxxxxxxx> wrote:

Actually that worked fine.
I do not pretend to be a DB2 performance maven. So, with his extremely
large data I am not sure which would be the better performer.

Rob Berendt
--
IBM Certified System Administrator - IBM i 6.1
Group Dekko
Dept 1600
Mail to: 2505 Dekko Drive
Garrett, IN 46738
Ship to: Dock 108
6928N 400E
Kendallville, IN 46755
http://www.dekko.com


-----Original Message-----
From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of
Alan Shore via MIDRANGE-L
Sent: Friday, December 20, 2019 8:17 AM
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxxxxxxxx>
Cc: Alan Shore <ashore@xxxxxxxx>
Subject: RE: Help with SQL

CAUTION: This email originated from outside of the organization. Do not
click links or open attachments unless you recognize the sender and know
the content is safe.


So the following wouldn't work?
select p.k1, p.k2, p.k3, p.k4
from vkparent p exception join vkchild c on
p.k1=c.k1 and
p.k2=c.k2 and
p.k3=c.k3 and
p.k4=c.k4 and
c.status = 'A'

Cannot test this as I am in a meeting without access to the AS/400

Alan Shore
E-mail : ASHORE@xxxxxxxx
Phone [O] : (631) 200-5019
Phone [C] : (631) 880-8640
'If you're going through hell, keep going.'
Winston Churchill


-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxxxxxxxx] On Behalf
Of Rob Berendt
Sent: Friday, December 20, 2019 8:06 AM
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxxxxxxxx>
Subject: [EXTERNAL] RE: Help with SQL

I think you're right. That STATUS column throws a wrinkle in it.
create table vkparent (
k1 char(1),
k2 char(1),
k3 char(1),
k4 char(1),
primary key(k1, k2, k3, k4)
)
;
create table vkchild (
k1 char(1),
k2 char(1),
k3 char(1),
k4 char(1),
status char(1),
k5 char(1),
d1 char(1),
primary key(k1, k2, k3, k4, k5)
);

insert into vkparent values('A', 'A', 'A', 'A'); insert into vkparent
values('B', 'B', 'B', 'B'); insert into vkparent values('C', 'C', 'C',
'C'); insert into vkparent values('D', 'D', 'D', 'D'); insert into vkchild
values('A', 'A', 'A', 'A', 'A', '1', 'X'); insert into vkchild values('B',
'B', 'B', 'B', 'I', '1', 'X'); insert into vkchild values('D', 'D', 'D',
'D', 'I', '1', 'X'); insert into vkchild values('D', 'D', 'D', 'D', 'A',
'2', 'Y');

select p.k1, p.k2, p.k3, p.k4
from vkparent p
where (p.k1, p.k2, p.k3, p.k4) not in ( select c.k1, c.k2, c.k3, c.k4
from vkchild c where c.status = 'A') ; This line won't get what you want
because 'D' has both an active and an inactive row.
select p.k1, p.k2, p.k3, p.k4, c.status
from vkparent p left outer join vkchild c on
p.k1=c.k1 and p.k2=c.k2 and p.k3=c.k3 and p.k4=c.k4 where c.status is
null or c.status<>'A'
;
l

Rob Berendt
--
IBM Certified System Administrator - IBM i 6.1 Group Dekko Dept 1600 Mail
to: 2505 Dekko Drive
Garrett, IN 46738
Ship to: Dock 108
6928N 400E
Kendallville, IN 46755
http://www.dekko.com


-----Original Message-----
From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of
Vinay Gavankar
Sent: Friday, December 20, 2019 7:28 AM
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxxxxxxxx>
Subject: Re: Help with SQL

CAUTION: This email originated from outside of the organization. Do not
click links or open attachments unless you recognize the sender and know
the content is safe.


I don't think the Left Outer Join or Exception join would work, as the JOIN
would be on 4 keys, and the sql would return only the records where the
JOIN is not successful. So it would return only records where there is no
match in child table. Maybe I am wrong, but that is what my test sql did.


On Fri, Dec 20, 2019 at 7:19 AM Rob Berendt <rob@xxxxxxxxx> wrote:

I did a simple google for sql list missing child rows
Basically it boiled down to a few choices between
NOT EXISTS
NOT IN
LEFT OUTER JOIN
EXCEPTION JOIN

Rob Berendt
--
IBM Certified System Administrator - IBM i 6.1
Group Dekko
Dept 1600
Mail to: 2505 Dekko Drive
Garrett, IN 46738
Ship to: Dock 108
6928N 400E
Kendallville, IN 46755
http://www.dekko.com


-----Original Message-----
From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of
Vinay Gavankar
Sent: Friday, December 20, 2019 7:14 AM
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxxxxxxxx

Subject: Help with SQL

CAUTION: This email originated from outside of the organization. Do not
click links or open attachments unless you recognize the sender and know
the content is safe.


Hi,

We have a Table with K1, K2, K3, K4 as Primary keys with about 800
million
records. A child table, which is partitioned, has K1, K2, K3, K4, K5 (Seq
Number) as Primary keys and a Status field (value of A or I) with about
10
billion records. Child table having no record for the 4 keys is possible,
though highly unlikely.

I need to get a list of records (just the key fields) from the main
Table,
which has no record in the child table with Status = 'A' (may or may not
have an 'I' Status record).

Can someone please help me with some efficient sql code to achieve this?
TIA.

Vinay
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