how to look for duplicate rows?

On 29/01/2010 16:40, zach cruise wrote:

i have to clean a table that looks like so:

create table test (sn integer, fname varchar(10), lname varchar(10));
insert into test values (1, 'adam', 'lambert');
insert into test values (2, 'john', 'mayer');
insert into test values (3, 'john', 'mayer');
insert into test values (4, 'mary', 'kay');
insert into test values (5, 'john', 'mayer');
insert into test values (6, 'susan', 'boyle');
insert into test values (7, 'susan', 'boyle');
insert into test values (8, 'mark', 'ingram');

for that, i need to run a query that returns like so:

result:
is_not_distinct
2, 3, 5
6, 7

How about something like:

select fname, lname from test
group by fname, lname
having count(1) > 1

...which gives you the names at least.

Ray.

--
Raymond O'Donnell :: Galway :: Ireland
rod@iol.ie

select distinct a.* from test a, test b where a.fname = b.fname
and a.lname=b.lname
and a.sn <> b.sn
Regards,
Jayadevan

From: zach cruise <zachc1980@gmail.com>
To: pgsql-general@postgresql.org
Date: 01/29/2010 10:09 PM
Subject: [GENERAL] how to look for duplicate rows?
Sent by: pgsql-general-owner@postgresql.org

i have to clean a table that looks like so:

create table test (sn integer, fname varchar(10), lname varchar(10));
insert into test values (1, 'adam', 'lambert');
insert into test values (2, 'john', 'mayer');
insert into test values (3, 'john', 'mayer');
insert into test values (4, 'mary', 'kay');
insert into test values (5, 'john', 'mayer');
insert into test values (6, 'susan', 'boyle');
insert into test values (7, 'susan', 'boyle');
insert into test values (8, 'mark', 'ingram');

for that, i need to run a query that returns like so:

result:
is_not_distinct
2, 3, 5
6, 7

using 8.1.

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