Re: Can I use subselect as a function parameter?

At 14:42 11/10/00 +0100, Oliver Elphick wrote:
>
>   CONSTRAINT ean CHECK (
>       CASE WHEN eancode IS NULL OR brand IS NULL
>         THEN 't'
>         ELSE ean_checkdigit(
>                 (SELECT ean_prefix
>                     FROM brandname, product
>                     WHERE brandname.id = product.brand
>                 ), eancode)
>       END
>   )
>);
>
>
>Can this be made to work at all (in 7.0.2)?
>

The short answer is that subselect in CHECK is not currently supported, and
is not planned for 7.1.

There was a thread about subselect in CHECK not so long ago (see 'checking
number of entries' on or around the 29/9). There was apparently also an
earlier discussion in which the meaning were not deemed to be clear. I
think the most recent discussion at least resolved the meaning, but not the
locking issues.


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