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Tom Kyte

Thanks for the question.

Asked: September 29, 2002 - 12:48 pm UTC

Last updated: September 04, 2008 - 1:36 pm UTC

Version: 8.1.7

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You Asked

Dear Tom,

I found there are a lot of duplication checking constraitns in our database.

How can I delete all of duplicated checking constraints ?

Thanks !

and Tom said...

alter table tname drop constraint constraint_name;

do that for each of the duplicated constraints.


You probably got these from doing repeated IMPORTS of dmp files and the you have "un-named" (named with system generated names) constraints.

You can avoid that by NAMING all constraints. That way, IMP will not "recreate them" each time.

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Comments

How to find out the duplicated values in a column

Mike, September 04, 2008 - 10:58 am UTC

I'd like to print a list of the duplicated values in a column or more. Thanks.
Tom Kyte
September 04, 2008 - 1:36 pm UTC

select column, count(*) from t group by column having count(*) > 1;
more

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