Distnct Keyword

Hi Everyone,
I've a select query having a distinct keyword to reduce the duplicates. Later I found that my query is taking a little bit more time to execute because of this distinct keyword. So I wrote my query some thing like this as mentioned below. But after this if the performance is not improving, then it's meaningless. My goal is to remove the distinct and achieve performance. Is there any alternative way. These queries are just sample.
DB version
{code}
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - 64bi
PL/SQL Release 10.2.0.1.0 - Production
"CORE    10.2.0.1.0    Production"
TNS for Linux: Version 10.2.0.1.0 - Production
NLSRTL Version 10.2.0.1.0 - Production
{code}
Queries
{code}
select distinct ecode from test;
select a.ecode test a
            where rowid >(select min(rowid) from test b
                           where a.ecode = b.ecode
                             and a.ename = b.ename);
{code}
Regards,
BS2012.

BS2012 wrote:
Hi Everyone,
I've a select query having a distinct keyword to reduce the duplicates. Later I found that my query is taking a little bit more time to execute because of this distinct keyword. So I wrote my query some thing like this as mentioned below. But after this if the performance is not improving, then it's meaningless. My goal is to remove the distinct and achieve performance. Is there any alternative way. These queries are just sample.
DB version
{code}
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - 64bi
PL/SQL Release 10.2.0.1.0 - Production
"CORE    10.2.0.1.0    Production"
TNS for Linux: Version 10.2.0.1.0 - Production
NLSRTL Version 10.2.0.1.0 - Production
{code}
Queries
{code}
select distinct ecode from test;
select a.ecode test a
            where rowid >(select min(rowid) from test b
                           where a.ecode = b.ecode
                             and a.ename = b.ename);
{code}
Regards,
BS2012.
Hi,
Can you try below code, please?
{code}
select ecode, ename from  test a
where  rowid = (select min(rowid) from test b
                           where a.ecode = b.ecode
                             and a.ename = b.ename);
{code}
This code  return distinct duplicated rows.
Regards
Mahir M. Quluzade
http://www.mahir-quluzade.com
p.s. It is my first reply on new OTN Forums!

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