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Re: Strange primary key error on insertion

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2011/10/6 Rory Campbell-Lange <rory@xxxxxxxxxxxxxxxxxx>
I have a strange issue (postgres 8.4) trying to insert old rows back
into the s_tbls table. A check on the primary key (n_id) between
s_tbl_import and s_tbls yields no matches, yet the index on s_tbls.n_id
yields an error when attempting to insert:

=> select n_id from s_tbl_import where n_id IN (
   select n_id from s_tbls);

    n_id
   ------
   (0 rows)

=> insert into s_tbls (select * from s_tbl_import);

   ERROR:  duplicate key value violates unique constraint "s_tbls_pkey"


Looks like you had duplicates in s_tbl_import. Try this:
SELECT * FROM s_tbl_import WHERE n_id IN (
    SELECT n_id from s_tbl_import group by n_id HAVING count(*)>1
);

Table "s_tbls"
     Column      |            Type             |                       Modifiers
------------------+-----------------------------+--------------------------------------------------------
 n_id             | integer                     | not null default nextval('s_tbls_n_id_seq'::regclass)
 dt_created       | timestamp without time zone | default now()
 dt_modified      | timestamp without time zone | default now()
 t_node           | text                        |
...
Indexes:
   "s_tbls_pkey" PRIMARY KEY, btree (n_id)
 

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