Re: Problems with UPDATE

If orf is not associated with a primary key or unique
index, the possible combinations might well exceed
14,000.  For example, if 3 records in yeast1 and 4
records in temp share the same orf value, the query
will update yeast1 12 times (i.e. the 3 yeast1 records
will be updated 4 times each).

Can you clarify (for the server or for us) the
relationship between the tables?  What primary keys or
indexes do these tables have?

Andrew

--- Evan Zane Macosko <macosko@fas.harvard.edu> wrote:
> Hello everyone,
>
>
> I am having a strange problem using the UPDATE
> function in Postgresql.  I
> want to move a large number (6000) of entries in one
> table to another, so
> here is my syntax:
>
> UPDATE yeast1 SET c1 = temp.profile_1 FROM temp
> WHERE yeast1.orf =
> temp.orf;
>
> This query results in over 14000 entries being
> added!  I end up with
> multiples of the same entry, which obviously is
> undesirable.  Does anyone
> have any suggestions on how to fix this?
>
> thanks!
> Evan
>
>
>
>
>
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