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Asked: 2026-05-23T17:58:34+00:00

I have two tables and I want to use the database to enforce a

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I have two tables and I want to use the database to enforce a constraint against them.

Table A has a one to many relationship with table B, that is many table B rows belong to exactly one table A row. Table B has a column of the Table A primary key that it belongs to. Anyway, I want to add a column to both table A and table B where the value of it in a table A record must equal the value of it in the corresponding table B records.

I want to tell SQL Server 2000 to disallow updates or additions of table B records unless the values in the sister columns are the same. How can I do this? I tried using a check constraint but it doesn’t like subqueries. Will I have to venture into the world of triggers? Is there another way?

Any help would be appreciated.

Thanks

Isaac

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1 Answer

  1. Editorial Team

    What you’re trying to do sounds like a foreign key relationship – but you already seem to have that (Table B has a column of Table A primary key).

    I don’t think you can define such a constraint – CHECK constraints cannot span tables, as far as I know. So in the end, you will probably need to use triggers instead on both tables to achieve this.

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