Re: Help with SQL

Any chance that the child table is a temporal table?
Is there something other than our traditional joining which may be better
on a temporal table? For example querying the main table for rows with no
previous temporal ranges.

Rob Berendt
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-----Original Message-----
From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of
Charles Wilt
Sent: Friday, December 20, 2019 10:15 AM
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxxxxxxxx>
Subject: Re: Help with SQL

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Join is going to be your best performance...

Ideally you'd want an index on child with (k1,k2,k3,k4, status)

Charles



On Fri, Dec 20, 2019 at 8:11 AM Vinay Gavankar <vinaygav@xxxxxxxxx> wrote:

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
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IBM Certified System Administrator - IBM i 6.1
Group Dekko
Dept 1600
Mail to: 2505 Dekko Drive
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Ship to: Dock 108
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-----Original Message-----
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Alan Shore via MIDRANGE-L
Sent: Friday, December 20, 2019 8:17 AM
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midrange-l@xxxxxxxxxxxxxxxxxx

Cc: Alan Shore <ashore@xxxxxxxx>
Subject: RE: Help with SQL

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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
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Kendallville, IN 46755
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-----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

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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

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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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