Question: hello , this is database oracle tables , i want to make a trigger function that will display automaticlly an error mesage if the customer

hello , this is database oracle tables , i want to make a trigger function that will display automaticlly an error mesage if the customer has more than 3 repair jobs . so the story is that we have a repair mobile store and our customer shold not have more than 3 repair jobs or he can't fix more than 3 mobiles

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