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

[Martin Bowes]

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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