On Mar 26, 2009, at 3:42 PM, George Sakkis wrote:
Hi all,
Is there a function similiar to Python's enumerate() [1] ? Searching
the docs didn't reveal any relevant builtin but I hope it's doable in
pgsql. Ideally I'd like a function that can be used as:
SELECT e.i, e.col1, e.col2
FROM enumerate(some_table, 'i') e
LIMIT 10
i col1 col2
=========
0 ... ...
1 ... ...
... ... ...
9 ... ...
Also ideally it should work on any rowset (e.g. nested select), not
just on concrete tables.
You're looking for what's called rownum in some other databases.
You can do it in postgresql with a temporary sequence, sometimes at
least:
abacus=# create temporary sequence bar;
CREATE SEQUENCE
abacus=# select setval('bar', 1, false);
setval
--------
1
(1 row)
abacus=# select nextval('bar'), baz from foo;
nextval | baz
---------+--------
1 | red
2 | yellow
3 | blue
Cheers,
Steve
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