RE: Fastest way to get a unique identifier/tracking column changes

Reeve wrote:
> I though the "IDENTITY" value was table-specific, not global.  Therefore,
to
> track changes from multiple tables in one "historical tracking" table,
I'd
> need to identify each tracking record by table and identity value.

Check the SQL type ROWID, it is unique across all DB2 UDB for
iSeries/zSeries .

>From Information Center:

A row ID is a value that uniquely identifies a row in a table. A column or
a host variable can have a row ID data type. A ROWID column enables queries
to be written that navigate directly to a row in the table. Each value in a
ROWID column must be unique. The database manager maintains the values
permanently, even across table reorganizations. When a row is inserted into
the table, the database manager generates a value for the ROWID column
unless one is supplied. If a value is supplied, it must be a valid row ID
value that was previously generated by either DB2 UDB for OS/390 and z/OS
or DB2 UDB for iSeries. The internal representation of a row ID value is
transparent to the user. The value is never subject to CCSID conversion
because it is considered to contain BIT data. The length attribute of a
ROWID column is 40.
Using ROWID is another way to have the system assign a unique value to a
column in a table. ROWID is similar to identity columns, but rather than
being an attribute of a numeric column, it is a separate data type. To
create a table similar to the identity column example:


 CREATE TABLE ORDERS
    (ORDERNO ROWID
    GENERATED ALWAYS,
    SHIPPED_TO VARCHAR (36) ,
    ORDER_DATE DATE)



 Bonne réception/Best regards
 Richard THEIS
   Education iSeries 400, Sce 8075, MTG
   01.49.14.46.34 /  Fax 01.43.04.59.85
   theis_richard@xxxxxxxxxx