On 07/12/12 20:13, MB Software Solutions General Account wrote:
> I've seen how to create a rule for data in a column using direct values
> (http://www.databasejournal.com/features/mssql/article.php/3811831/Using-Check-Constraints-to-Validate-Data-in-SQL-Server.htm).
>
> But I want to basically say "Only allow values in this FK field that exist
> as PKs in that other table."
>
> How do I do that?
If you're doing lots and lots of them,
SELECT UNIQUE <pk-field> FROM <othertable> INTO ARRAY OKFields
keep the array around, then
IF ASCAN(OKFields, <FKvalue> > 0
-- it's good --
If this is a rare thing,
SELECT <pk-field> INTO ARRAY Dummy FROM <OTHERTABLE> ;
WHERE <pk-field> = <FKvalue>
if alen(Dummy) > 0
-- it's good --
Dan Covill
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