Autonumber as Composed key

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Autonumber as Composed key

Situation: At SQL Assistant, I need to create a table using an autonumber field as part of a composed primary key

Complication: When I set that autonumber field on UNIQUE PRIMARY INDEX statement, I get an error msg 5784 - “illegal use of identity field”.

What am I doing wrong? Where can I find more details about this kind of error msg?

Eg:
CREATE TABLE LIB.TABLE
( Transaction_ID INTEGER TITLE 'Transaction ID' NOT NULL GENERATED BY DEFAULT AS IDENTITY
(START WITH 1
INCREMENT BY 1
MINVALUE 1
MAXVALUE 999999999
NO CYCLE),
Party_ID INTEGER TITLE 'Party ID' NOT NULL)
UNIQUE PRIMARY INDEX ( Transaction_ID , Party_ID );

The intention is to have a table like if we have this on the table:
Transaction_ID Party_ID
1 1
1 2
2 1

Rgds
Cassiano
1 REPLY

Re: Autonumber as Composed key

Identity columns cannot be used as part of a composite primary or secondary index. It doesn't make sense as part of a PI since the identity is inherently unique. Take a look at the create table (column definition clause) documentation, it's on page 1-318 in the V2R5.1 Data Definition Statements manual.