Re: sql rand function

GUIDs are actually 16-byte (128-bit) values, what we see here is the character representation used by Microsoft, I just read that this is a use as a URN, or Universal Resource Name.

I don't see any way here to guarantee that it is unique on the system where it is generated, which is what GUIDs are supposed to be I also just read that there is a version number at a certain position, somewhere in the middle of the whole thing. But this technique is definitely GUID-like, as it doesn't follow the standard as to version location.

I have kind of spent time concerned with GUIDs, as we ran into duplicates when generated on both the IBM i and in a Windows-Mobile app - no guarantee of uniqueness that way.

Cheers
Vern

On 11/13/2022 6:57 AM, Therrien, Paul via MIDRANGE-L wrote:

I found this piece of code very interesting.
Thanks Steve

-----Original Message-----
From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of Steve Richter
Sent: Friday, November 11, 2022 9:57 PM
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxxxxxxxx>
Subject: Re: sql rand function

Here is sql code lifted from stack overflow that uses rand( ) to generate a GUID like value. Looks pretty random to me.

select LEFT(TRANSLATE ( CHAR(BIGINT(RAND() * 10000000000 )),
'abcdef123456789', '1234567890' ),8)
CONCAT '-' CONCAT
LEFT(TRANSLATE ( CHAR(BIGINT(RAND() * 10000000000 )),
'abcdef123456789', '1234567890' ),4)
CONCAT '-' CONCAT
LEFT(TRANSLATE ( CHAR(BIGINT(RAND() * 10000000000 )),
'abcdef123456789', '1234567890' ),4)
CONCAT '-' CONCAT
LEFT(TRANSLATE ( CHAR(BIGINT(RAND() * 10000000000 )),
'abcdef123456789', '1234567890' ),4)
CONCAT '-' CONCAT
LEFT(TRANSLATE ( CHAR(BIGINT(RAND() * 10000000000000 )),
'abcdef123456789', '1234567890' ),12)
from qrpglesrc
order by 1


On Fri, Nov 11, 2022 at 8:19 PM Jay Vaughn <jeffersonvaughn@xxxxxxxxx>
wrote:

lol! thanks Mark (not so random)

On Fri, Nov 11, 2022 at 8:12 PM Mark Waterbury <
mark.s.waterbury@xxxxxxxxxxxxx> wrote:

See:
https://www.ibm.com/support/pages/sql-rand-function-not-so-random

On Friday, November 11, 2022 at 07:53:26 PM EST, Jay Vaughn <

jeffersonvaughn@xxxxxxxxx> wrote:

anyone ever use this?

if i do values rand(1000000) I get the same number everytime ... in

strsql.

if I page up or down that number changes randomly...
How can I retrieve a random number anytime I need one?

tia
Jay
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