Re: FROM Clause subquery - Mailing list pgsql-general

From Darren Ferguson
Subject Re: FROM Clause subquery
Date
Msg-id Pine.LNX.4.10.10203110952100.13583-100000@thread.crystalballinc.com
Whole thread Raw
In response to FROM Clause subquery  ("DongSoo Song" <namsanmo@kehc.org>)
List pgsql-general
select * from (select relname from pg_class where relkind='S') as foo;
             relname
---------------------------------
 user_seq
 util_seq
 reftable_seq
 apps_seq
 acl_seq
 message_seq
 problem_seq
 customer_seq
 service_seq
 job_schedule_schedule_id_seq
 scheduling_ru_sched_rule_id_seq
 time_units_tu_id_seq
 data_types_data_type_id_seq
 counter
 expertise_exp_expertise_id_seq
 grades_grd_grade_id_seq
 occupation_occ_occupation_i_seq
 personnel_psl_employee_id_seq
 vacations_vac_period_id_seq
 package_package_id_seq
 builder_builder_id_seq
 pricetype_pricetype_id_seq
 price_price_id_seq
 actions_action_id_seq
 wot_list_wot_id_seq
 wot_task_types_wot_task_id_seq
 tt_task_types_tt_task_type__seq
 tt_task_mater_tt_task_mater_seq
 tasks_task_id_seq
 fl_up_results_flup_res_id_seq
 follow_ups_fl_up_id_seq
 wo_log_wo_log_id_seq
 wo_comments_wo_comments_id_seq


Works for me

dev=> select version();
                          version
-----------------------------------------------------------
 PostgreSQL 7.2 on i686-pc-linux-gnu, compiled by GCC 2.96

I just cut and pasted your query.

If you mean why is it returning just the name of the sequence then

it is because that is all you are asking for in the sub query

Darren Ferguson

On Mon, 11 Mar 2002, DongSoo Song wrote:

> Hi All
>
> I have problems on 'from clause subquery'.
>
> test=# create sequence test_seq;
> test=# select * from test_seq
>
> Result:
>
>  sequence_name | last_value | increment_by |      max_value      | min_value | cache_value | log_cnt | is_cycled |
is_called
>
---------------+------------+--------------+---------------------+-----------+-------------+---------+-----------+-----------
>  test_seq      |          1 |            1 | 9223372036854775807 |         1 |           1 |       1 | f         | f
> (1 row)
>
> Now I want to get sequence fields following:
>
> test=# select * from (select relname from pg_class where relkind='S') as foo;
>
> My Result:
>
>          relname
> -------------------------
>  test_seq
> (1 rows)
>
> Why? FROM Clause subquery not working? or my mistakes?
>
> Help Me!
>
> Bye.
>
>


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