Re: Subselects not allowed?

Leif Biberg Kristensen <leif(at)solumslekt(dot)org> wrote:

> Can anybody tell me why this doesn't work?
>
> pgslekt=> CREATE SEQUENCE sources_source_id_seq START WITH (SELECT
> MAX(source_id) FROM sources);
> ERROR: syntax error at or near "("
> LINE 1: CREATE SEQUENCE sources_source_id_seq START WITH (SELECT MAX...
> ^
> pgslekt=>
>
> regards, Leif

You can't do that, but you can do this:

test=# select * from foo;
i
----
98
99
(2 rows)

Time: 0,146 ms
test=*# \ds seq_foo;
No matching relations found.
test=*# do $$ declare m int; begin select into m max(i) from foo; execute 'create sequence seq_foo start with ' || m; end; $$;
DO
Time: 1,115 ms
test=*# \ds seq_foo;
List of relations
Schema | Name | Type | Owner
--------+---------+----------+------------
public | seq_foo | sequence | kretschmer
(1 row)

test=*# select * from seq_foo;
sequence_name | last_value | start_value | increment_by | max_value | min_value | cache_value | log_cnt | is_cycled | is_called
---------------+------------+-------------+--------------+---------------------+-----------+-------------+---------+-----------+-----------
seq_foo | 99 | 99 | 1 | 9223372036854775807 | 1 | 1 | 1 | f | f
(1 row)

I'm using 9.1Beta, but it works since 9.0, see:
http://www.depesz.com/index.php/2009/11/01/waiting-for-8-5-do/#more-1535

Andreas
--
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