Re: how to return field based on field= NULL or not - Mailing list pgsql-general

On Mon, Aug 24, 2009 at 12:54:31PM +0200, Alban Hertroys wrote:
>     CASE
>     WHEN fieldA IS NOT NULL THEN fieldA
>     WHEN fieldB IS NOT NULL THEN fieldB
>     WHEN fieldC IS NOT NULL THEN fieldC
>     ELSE fieldD
>     END

BTW, the above expression is identical to:

  COALESCE(fieldA,fieldB,fieldC,fieldD)

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  Sam  http://samason.me.uk/