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)
