Re: Object-oriented thinking in SQL context?

From: rpost <rpost_at_pcwin518.campus.tue.nl>
Date: Thu, 18 Jun 2009 21:17:16 +0000 (UTC)
Message-ID: <h1eass$2imf$4_at_mud.stack.nl>

Brian Selzer wrote:

[...]

>[...] The view update problem is the result of the ambiguity inherent
>in the relational expressions that define views.

Perhaps it helps to state the cause of the ambiguity: when an expression defines a non-injective transformation, there is no (unique) inverse transformation, hence the ambiguity.

-- 
Reinier

Received on Thu Jun 18 2009 - 23:17:16 CEST

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