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Asked: 2026-05-18T03:44:01+00:00

I have a table in my database (TableA) that has a column (TableA.Column1) that

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I have a table in my database (TableA) that has a column (TableA.Column1) that only allows values from certain rows of another table (TableB.Column2). This is very similar to a normal foreign key relation except for the fact that only certain rows from TableB.Column2 are allowed. For example, I may only allow rows from TableB.Column2 where TableB.Column3 > 100;

Is there a way to express this type of referential integrity in a database? I’ve tried adding a where clause to a foreign key and I’ve tried adding a subquery to a Check constraint. I’ve not gotten either to work.

Does anyone have any advice?

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1 Answer

  1. Editorial Team

    The answer may differ depending on the database system you are using. But an option is certainly to use a trigger.

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