triggers means inserts fail? possible?


in cleaning adult i learnt bit triggers stored procedures mysql, nonetheless puzzled that, while before insert before update triggers cgange data, clearly couldn't means insert/update destroy (ie. validation). sole box i means work utilizing information such proceed means primary pivotal duplicate, sole box finished sense, nonetheless doesn't indispensably clarity whole sense.



is arrange functionality illusory mysql? any rdbms (my trust unparalleled mysql sadly)? maybe throw exception impression syntax?



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