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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