Servers Performance Monitoring Introduction During a load test, it is important to know the health of the servers loaded. It is also nice to see if you are targeting a cluster if the load is correctly dispatched. To address this, the plugin package n
初学ExtJs,做项目的时候想做一个这样的效果:点击按钮弹出对话框,之前一直是使用EasyUi来做的, EasyUi里有Dialog,用起来很方便,但是现在转移到ExtJs上后,发现没有Dialog这样的框架,在网上找了没有找到这样的 控件,于是搜索一下关于ExtJs 对话框的实现方法,现在将实现结果贴出来,如果有什么想法,希望多多留言! Ext.get("btn_edit").on("click", function () { var form = new Ext
users 表中有 两个字段 id 和 name 表数据大概如下: id name 1 AAA 2 BBB 3 CCC 4 AAA 请写查询语句查询出name字段中重复的值. 这个需要用到子查询 先查询出重复字段的值,根据分组统计name字段相同值的 数据条数大于1的就是重复的数据 即 select name from users group by name having count(*) > 1 查到重复的数据 指的是得到了重复
查询所给的表中值为空的总数 判断字段是否为空的sql语句 SELECT sex FROM id where sex is not NULL SELECT COUNT(*) t FROM id where sex is NULL UNION ALL SELECT COUNT(*) t FROM id WHERE cardid is NULL SELECT SUM(t) FROM (SELECT COUNT(*) t FROM id where sex is NULL UNION ALL SELE