Re: Duplicate rows

Edward W. Rouse <erouse(at)comsquared(dot)com> wrote:

> Is there any way to remove a duplicate row from a table? Not my db but I have
> to work with it. On version 7.4 right now.
>

How to select the right records?

You can try to use the ctid-column, see my simple example:

test=# select * from dups ;
i
---
1
1
1
2
2
3
4
(7 Zeilen)

Zeit: 0,145 ms
test=*# delete from dups where (ctid, i) not in (select max(ctid), i from dups group by i);
DELETE 3
Zeit: 0,378 ms
test=*# select * from dups ;
i
---
1
2
3
4
(4 Zeilen)

Andreas
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