recently I have found several tables has exactly the same pkey, here is
the definition:
"diggcontent_data_account_pkey" PRIMARY KEY, btree (thing_id, key)
the data is like this:
159292 | funnypics_link_point | 41
| num
159292 | funnypics_link_point | 40
| num
I could not even update this record.
really confused about how could this happen... thanks!