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An alter event statement modifies the definitions and properties of the event. We can make an event stop or make it active again, or we can modify the name of an event or the entire schedule. However, when an event defined using the ON COMPLETION NOT PRESERVE attribute is executed for the last time, the event does not exist directly and cannot be modified.First of all, let's introduce the business: in the purchase process, you can select the color of the mobile phone and enter the purchase quantity. At the same time, there are two display areas in the page, which respectively display the color and quantity that the user has just selected. There is also a button that dynamically displays the next operation. We need to query the inventory corresponding to the mobile phone of this color. If the inventory quantity is less than the purchase quantity this time, the button will be disabled and the copy with insufficient inventory will be displayed. Otherwise, the button will be highlighted and can be clicked and displayed if the shopping cart is displayed.史蒂芬搬进了一栋新的公寓，急需安装有线电视。不久，电视安装员杜哲来了，他那怪僻的行为着实令史蒂芬费解。但是杜哲是个极为幽默的人，更重要的是，他还给史蒂芬装了“免费”有线电视，这使史蒂芬觉得与之有话好说了。一次，他俩一起去有线电视发射塔上聊天，其间，杜哲知晓了史蒂芬的女友洛萍正在与他闹矛盾。What is the event distribution mechanism?NBC续订《全程直击》10集的第二季。壁の小説 大塚寧々 升毅见此，五大门派不禁又退后几步，如果张三丰真要出手，他们根本挡不住。