<script type="text/javascript"> function updateTime(){ var timeNow = new Date(); var hour = timeNow.getHours(); var minute = timeNow.getMinutes(); var second = timeNow.getSeconds(); var millisecond= timeNow.getMilliseconds(); //获取表盘上的指针进行旋…
1. 先讨论 in 与 not in中存在NULL的情况, sql语句如下: 1 select 1 result1 from dual where 1 not in (2, 3); 2 3 4 select 1 result2 from dual where 1 not in (2, 3, null); 5 6 7 select 1 result3 from dual where 1 in (2, 3, null, 1); 8 9 10 select 1 result4 from dual…