Engineering, 18.11.2019 20:31 king514
Suppose you want to enforce the following constraint: when inserting a tuple into the purchase relation, custid must also exist in the customer relation. if custid does not exist in the customer table, automatically insert it into the customer table (you can set the zipcode value to be null). write a trigger statement to do this;
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Suppose you want to enforce the following constraint: when inserting a tuple into the purchase rela...
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