I have some validation rules. There are two tables, NODE and METANODE. Here the METANODE column SUBTYPE will depend...
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on the value of the NODE column NODETYPE. So, if NODETYPE of NODE has a value of 'Role' then SUBTYPE of METANODE might have the value 'Process'.
NODE METANODE -------------- --------------- NODETYPE : Role SUBTYPE : Process
How can I put a constraint for this?
This is one of three questions this week, to which, I'm afraid, the answer is no.[The others were A running total and SQL to update the header records?]
No, I don't think you can declare a constraint.
This looks very much like the entity-attribute-value model. I personally would avoid it. Here are some links for further opinions:
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