Mladen Gogala <mladen.gog...@vmsinfo.com> wrote:
 
> How is it possible to insert the same value twice into a UNIQUE
> index?
 
You get multiple entries for the same value in a UNIQUE indexes all
the time in PostgreSQL.  Any non-HOT update of a table with a UNIQUE
index will cause that.  You just can't have duplicate entries with
overlapping visibility.
 
-Kevin

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