Re: Adding auto-increment / sequence

am Mon, dem 21.05.2007, um 18:29:46 -0700 mailte camb folgendes:
> Hey all,
> Is there any way to add some kind of sequence of auto-incrementing
> column to the result set returned by a SELECT?

Yes.

You can use an sequence similar this:

test=# select * from foo;
col1 | col2 | col3
------+------+------
1 | 2 |
2 | |
(2 rows)

test=*# create sequence foo_seq;
CREATE SEQUENCE
test=*# select nextval('foo_seq'), * from foo;
nextval | col1 | col2 | col3
---------+------+------+------
1 | 1 | 2 |
2 | 2 | |
(2 rows)

Don't forget to reset this sequence, the next select nextval() starts
with the current value and returns 3.

Other way: write an set-returning function and count the rows there.

Andreas
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Andreas Kretschmer
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