[Info-ingres] One up unique number for an attribute - in SQL - does anyone know the trick of doing this?

[Allan Biggs]

Martin,

Thanks for this - I don't have 10.2 documentation on my PC and the ESD 
site seems to be down or very busy this afternoon so was unable to look it 
up.

The number of times I have needed to do this and struggled with internal 
procedures   :-) 

cheers 
Allan



From:   Martin Bowes <martin.bowes at ndph.ox.ac.uk>
To:     Allan Biggs <Allan.Biggs at GBR.dupont.com>
Cc:     "info-ingres at lists.planetingres.org" 
<info-ingres at lists.planetingres.org>
Date:   06/02/2017 15:47
Subject:        RE: [Info-ingres] One up unique number for an attribute - 
in SQL - does anyone know the trick of doing this?



Create the table using an identity column or have the column take a column 
default which is the next value from a sequence.
 
Martin Bowes
 
From: Allan Biggs [mailto:Allan.Biggs at GBR.dupont.com] 
Sent: 06 February 2017 15:42
To: info-ingres at lists.planetingres.org; openroad-users at googlegroups.com
Subject: [Info-ingres] One up unique number for an attribute - in SQL - 
does anyone know the trick of doing this?
 
in command line sql I am populating a new table - one of the columns is a 
sort order 

each row of this field  must be a 'one up' unique number starting at 1 and 
ending as the number of rows in the table   


I know that I could do this in OpenROAD , and in another guise this is 
done in OpenROAD,  but in this case it has to be done in SQL or maybe in 
report writer. 

It does not matter  which rows contain  1 ,2 etc although one of the 
columns does have a set of unique numbers with gaps which could be used to 
determine the order of row 1, 2 etc.   

Does anyone know of a 'trick' to do this? 

In mysql it is possible to define unique one up numbers when creating a 
table does modern Ingres have this feature? 

thanks 
Allan 

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