sql - PostgreSQL duplicate key when update non-unique column -


i run query bellow on postgresql 9.3.2. can tell me why query bellow throw unique violation exception while not update unique column.

the contents table have 2 trigger insert , update other table.

execute command failed: error:  duplicate key value violates unique constraint "contents_0_uk" detail:  key (hash)=(\x145806e0794729ba98f16e4e8ec723cb) exists. context:  sql statement "update contents cont     set     content         = tmp.content,             primitive       = tmp.primitive,             lang            = array[lang_id(tmp.lang[1]), lang_id(tmp.lang[2]), lang_id(tmp.lang[3])],             percent         = tmp.percent,             score           = tmp.score     tmp_post_bulk tmp     tmp.cid = cont.id             , tmp.chash_matched = true             , (                     cont.content            != tmp.content                     or cont.primitive       != tmp.primitive                     or cont.percent         != tmp.percent                     or cont.score           != tmp.score                     or cont.lang            != array[lang_id(tmp.lang[1]), lang_id(tmp.lang[2]), lang_id(tmp.lang[3])]             )" pl/pgsql function content_bulk() line 53 @ sql statement ! query is: select content_bulk();

i have find out problem same postgres, duplicate unique index

because there duplicateds row in table (unique column duplicated), when query update duplicated rows, postgresql throw exception.

i manual remove duplicated rows.


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