如果事件立即执行且只执行一次,则只需要在onschedule子句内添加()关键字?
A. at
B. every
C. starts
D. ends
以下查看当前数据库内event_xs_delete事件状态信息的语句正确的是()。
A. showeventsevent_xs_delete;
B. showevents'event_xs_delete';
C. showeventslike'event_xs_delete';
D. showeventslikeevent_xs_delete;
以下查看当前数据库内event_xs_delete事件定义语句的语句正确的是()。
A. showcreateevent'event_xs_delete';
B. showcreateeventevent_xs_delete;
C. showcreateeventlike'event_xs_delete';
D. showcreateeventlikeevent_xs_delete;
MySQL()取代了原先只能有由操作系统的计划任务来执行的工作。【请填写五个中文汉字】