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  3. January 2020

Re: Help with SQL

I considered Birgitta's solution...

But I think mine would be more efficient.

Visual Explain would tell you for sure.

It's possible the query engine would optimize both into the same internal
steps.

Charles

On Fri, Jan 17, 2020 at 8:05 AM Vinay Gavankar <vinaygav@xxxxxxxxx> wrote:

Thanks Charles and Birgitta. Both worked fine in DEV. Given that TABB has
over 10 billion record in Prod, which one would be more efficient?

On Fri, Jan 17, 2020 at 12:13 AM Birgitta Hauser <Hauser@xxxxxxxxxxxxxxx>
wrote:

May be:

Select Distinct a.*
From Tablea a Join Tableb b
on a.Fld1 = b.Fld1
and b.Fld2 = 'P'
and b.Fld3 > 20190101

Mit freundlichen Grüßen / Best regards

Birgitta Hauser


"Shoot for the moon, even if you miss, you'll land among the stars." (Les
Brown)
"If you think education is expensive, try ignorance." (Derek Bok)
"What is worse than training your staff and losing them? Not training
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and keeping them!"
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-----Original Message-----
From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of
Vernon
Hamberg
Sent: Freitag, 17. Januar 2020 03:30
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxxxxxxxx

Subject: Re: Help with SQL

I think Charles meant b.fld1 = a.fld1 - otherwise, this looks fine.

On 1/16/2020 7:58 PM, Charles Wilt wrote:
select *
from taba A
where exists (select 1 from tabb B
where b.fld1 - a.fld1
and b.fld2 = 'P' and fld3 > 20190101
)

Charles


On Thu, Jan 16, 2020 at 4:20 PM Vinay Gavankar <vinaygav@xxxxxxxxx>
wrote:

Hi,

I need some help with SQL.

I have 2 Tables TABA & TABB which have a common field, say FLD1

TABA is unique on FLD1. TABB has millions of records for one value of
FLD1.
TABB is a partitioned file with billions of records.

TABB also has FLD2 for Status and FLD3 for date (field type is
decimal).

I want to select all records in TABA where there is at least one
record in TABB with matching FLD1 and FLD2 = 'P' and FLD3 > 20190101

Can anyone please suggest sql. It is a one-time exercise.
Also, if anyone is familiar with 'SEQUEL' by HelpSystems, we are
required to use that on prod boxes, and there are subtle differences
in
the syntax.

TIA for the help
Vinay Gavankar
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