I'm not 100% certain but as far as I know, yes it's not possible. The purpose of rules is to rewrite queries, sort of a macro system: "you write X and I write y". If the source and the target are the same, the rule itself gets re-activated.
A trigger instead is a precondition (or post condition) to a query.
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I'm not 100% certain but as far as I know, yes it's not possible. The purpose of rules is to rewrite queries, sort of a macro system: "you write X and I write y". If the source and the target are the same, the rule itself gets re-activated.
A trigger instead is a precondition (or post condition) to a query.