How about this:
delete from stupid_table s
where timestamp != (select min(timestamp)
from stupid_table
where b = s. b
and c = s.c
and d = s.d
and a = 2)
and a=2;
>
> Given a business rule that says a combination of three columns must
> be
> unique if and only if a fourth column equals a certain value, and if
> the table in question contains rows that violate this requirement,
> I'm
> trying to write a single SQL statement that will remove the
> duplicates.
> Of each set of duplicate rows, I'll delete the one with the latest
> insert timestamp.
>
> Let's call the columns
>
> a b c d timestamp
>
> The combination of b, c, and d must be unique if a = 2.
>
> I can get the duplicate row values along with the latest timestamp
> via
>
> select max(tstamp), a, b, c from
> my_table group by a, b, c having count(*) > 1
>
> But I can't figure out how to use that in a delete statement.
>
> Suggestions greatly appreciated!
>
>
> Paul Baumgartel
>
>
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