>Bruce Momjian <pgman@candle.pha.pa.us>
>
>> emkxp01=> delete from deltest s1 where s1.respdate not in ( select
>> min(s2.respdate) from deltest s2 where s1.sessionid = s2.sessionid);
>> ERROR: parser: parse error at or near "s1"
>> emkxp01=>
>
>Don't use s1. Just refer to native deltest in the subquery. That
>should reference the outer table.
That doesn't seem to work as 3 rows are deleted and not just the
two duplicates.
emkxp01=> delete from deltest where respdate not in ( select min(s2.respdate)
from deltest s2 where sessionid = s2.sessionid);
DELETE 3
emkxp01=> select * from deltest;sessionid | respdate
-----------+------------------------------ 1 | Tue 07 Dec 22:32:01 1999 GMT
(1 row)
emkxp01=>
Keith.