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From: =?iso-8859-1?Q?Johannes_Gr=F8dem?= <johs@copyleft.no>
To: Stephen Patterson <s.patterson@freeuk.com>
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Subject: Re: Finding table constraints
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> Is there any way to find out what constraints have been set on a table
> or on columns in a table?

Take a look at the source for psql.

-- 
johs