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How to find tables with nullable Unique Keys [message #630971]

Wed, 07 January 2015 04:25

testoli
Messages: 1
Registered: January 2015
Location: Germany

Junior Member

Hi,

I am facing an issue with tables that do have a unique key which is nullable.
Now I need to find all tables in a schema which has UI with nullable = Y.

Any script available?

Thanks a million....

Oliver

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Re: How to find tables with nullable Unique Keys [message #630973 is a reply to message #630971]

Wed, 07 January 2015 04:47

Michel Cadot
Messages: 68776
Registered: March 2007
Location: Saint-Maur, France, https...

Senior Member
Account Moderator

dba_constraints gives you the unique constraints
dba_cons_columns gives you the columns of these constraints
dba_tab_columns.nullable gives you if the column is nullable or not in its definition
dba_cons_columns join to dba_constraints give you if the column is part of a check constraint then you have to test if the check constraint is like "column IS NOT NULL".

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