[SQL] Finding duplicated values

[Kent Anderson]

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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