Finding duplicated values

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I have a few tables that have duplicated values from an import from a
different database. I have two keys I tried to set as primary and got an
error
ERROR: could not create unique index
DETAIL: Table contains duplicated values.

Is there some join I can use to compare the hmhmkey, wmwmkey pairs against
the table to find duplicate values? Each pair key should be unique but the
old database was less than normalized.

I was trying to use the code below but it returned no rows.

SELECT hmhmkey, wmwmkey
FROM exceptions
EXCEPT
SELECT hmhmkey, wmwmkey
FROM exceptions;

Any suggestions?

Kent Anderson
EZYield.com
407-629-0900
www.ezyield.com

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Re: Finding duplicated values

Kent Anderson wrote:
> I have a few tables that have duplicated values from an import from a
> different database. I have two keys I tried to set as primary and got an
> error
> ERROR: could not create unique index
> DETAIL: Table contains duplicated values.
>
> Is there some join I can use to compare the hmhmkey, wmwmkey pairs
> against the table to find duplicate values? Each pair key should be
> unique but the old database was less than normalized.
>
> I was trying to use the code below but it returned no rows.
>
> SELECT hmhmkey, wmwmkey
> FROM exceptions
> EXCEPT
> SELECT hmhmkey, wmwmkey
> FROM exceptions;
>
> Any suggestions?
>
> Kent Anderson
> EZYield.com
> 407-629-0900
> www.ezyield.com

Try http://archives.postgresql.org/pgsql-sql/1999-03/msg00239.ph p

Re: Finding duplicated values

On Thu, 21 Oct 2004, Kent Anderson wrote:

> I have a few tables that have duplicated values from an import from a
> different database. I have two keys I tried to set as primary and got an
> error
> ERROR: could not create unique index
> DETAIL: Table contains duplicated values.
>
> Is there some join I can use to compare the hmhmkey, wmwmkey pairs against
> the table to find duplicate values? Each pair key should be unique but the
> old database was less than normalized.

Maybe
SELECT hmhmkey, wmwmkey
FROM exceptions
GROUP BY hmhmkey, wmwmkey
HAVING count(*)>1;

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Re: Finding duplicated values

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Kent Anderson wrote:

> I have a few tables that have duplicated values from an import from a
> different database. I have two keys I tried to set as primary and got
> an error
> ERROR: could not create unique index
> DETAIL: Table contains duplicated values.
>
> Is there some join I can use to compare the hmhmkey, wmwmkey pairs
> against the table to find duplicate values? Each pair key should be
> unique but the old database was less than normalized.
>
> I was trying to use the code below but it returned no rows.
>
> SELECT hmhmkey, wmwmkey
> FROM exceptions
> EXCEPT
> SELECT hmhmkey, wmwmkey
> FROM exceptions;
>
> Any suggestions?
>
> Kent Anderson
> EZYield.com
> 407-629-0900
> www.ezyield.com
>
> ========================================
> This electronic message transmission contains information from the
> Company that may be proprietary, confidential and/or privileged. The
> information is intended only for the use of the individual(s) or
> entity named above. If you are not the intended recipient, be aware
> that any disclosure, copying or distribution or use of the contents of
> this information is prohibited. If you have received this electronic
> transmission in error, please notify the sender immediately by
> replying to the address listed in the "From:" field.
>

******************************
This might do it...
If you do this on the table that had duplicates you wont need to join
select count(hmhmkey),count(wmwmkey) from
exceptions group by hmhmkey,wmwmkey having count(hmhmkey) >1 or having
count(wmwmkey) >1;



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Kent Anderson wrote:

type="cite">

I
have a few tables that have duplicated values from an import from a
different database. I have two keys I tried to set as primary and got
an error

ERROR: 
could not create unique index

DETAIL:  Table contains duplicated values.

 

Is
there some join I can use to compare the hmhmkey, wmwmkey pairs against
the table to find duplicate values? Each pair key should be unique but
the old database was less than normalized.

 

I was
trying to use the code below but it returned no rows.

 

SELECT
hmhmkey, wmwmkey

FROM   exceptions

EXCEPT

SELECT hmhmkey, wmwmkey

FROM 
exceptions;

 

Any
suggestions?

 

Kent Anderson

EZYield.com

407-629-0900

 

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This electronic message transmission
contains information from the Company that may be proprietary,
confidential and/or privileged. The information is intended only for
the use of the individual(s) or entity named above.  If you are not the
intended recipient, be aware that any disclosure, copying or
distribution or use of the contents of this information is prohibited. 
If you have received this electronic transmission in error, please
notify the sender immediately by replying to the address listed in the
"From:" field.

 

Re: Finding duplicated values

Kent Anderson wrote:

> I have a few tables that have duplicated values from an import from a
> different database. I have two keys I tried to set as primary and got
> an error ERROR: could not create unique index
> DETAIL: Table contains duplicated values.Is there some join I can use
> to compare the hmhmkey, wmwmkey pairs against the table to find
> duplicate values? Each pair key should be unique but the old database
> was less than normalized.I was trying to use the code below but it
> returned no rows.SELECT hmhmkey, wmwmkey
> FROM exceptions
> EXCEPT
> SELECT hmhmkey, wmwmkey FROM exceptions;Any suggestions?Kent
> Anderson

You might want to search the [SQL] archive on the following topics
for more inspiration:

selecting duplicate records
Delete 1 Record of 2 Duplicate Records

Regards, Christoph



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