On Mon Aug 24, 2015 at 08:46:57AM +0200, Mark Lawrence wrote:
> 
> You can achieve this using a partial index[1] on the Books.title
> column, which is used only when the author is null. A test script to

My apologies. It appears from the mailing list archive this was already
mentioned, but I didn't see those messages in my inbox.

-- 
Mark Lawrence

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