Hello everybody

I have two tables in a parent-child relation.

How can I avoid to save a row in the parent table if there is not a row in
the child table?

If the parent table has a row and the child table has one (or several) rows,
it is ok.

If the parent table has a row and the child table has not one (or several)
rows, reject.

Thank you in advance.

Walter.


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