23对一个视图myView 创建一个触发器mytrigger语句为。选择一项aCREATE TRIGGER mytriggerDEFORE INSERT ON myView BEGIN -----bCREATE TRIGGER mytriggerAFTERINSERT ON myViewBEGIN---cCREATE TRIGGER mytriggerINSTEAD OFINSERT ON myV
c)CREATE TRIGGER mytrigger INSTEAD OF INSERT ON myView BEGIN
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