Re: [SQL] Duplicate rows

Hi!

On Sat, 16 May 1998, Andy Lewis wrote:
> Right, I know that there are dups in the column. But, I don't know where they
> are nor do I know their value(s). I want to be able to find, say, two interger
> values that are in the same column but, different rows.

It seems that you need a correlated subquery - a loop for every row, that
tests whether there are equal values.

SELECT oid, mycolumn FROM mytable a
WHERE mycolumn IN
(SELECT oid, mycolumn FROM mytable b
WHERE a.oid <> b.oid)

Or may be, join with the same table. Not sure what is better in this
situation.

SELECT oid, mycolumn FROM mytable a, mytable b
WHERE a.oid <> b.oid AND
a.mycolumn = b.mycolumn

In both cases "a.oid <> b.oid" excludes the same row from comparison (I
am pretty sure that in the same row a.mycolumn = b.column :).

Oleg.
----
Oleg Broytmann http://members.tripod.com/~phd2/ phd2(at)earthling(dot)net
Programmers don't die, they just GOSUB without RETURN.