判断mysql字段是否为空
字段内容为空有两种情况
1.为null
2.为字符串的空''
字段 is null or trim(字段)=''
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Windows Server 2003/2008/2008 R2的方法是完全一样的,没有任何区别。不过2008 R2系统要先打开服务管理,添加角色,安装“网络策略和访问服务”,...
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