大约有 40,000 项符合查询结果(耗时:0.0286秒) [XML]

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Why use the SQL Server 2008 geography data type?

...tance < 500 * 1609.344 orderby distance select f; return q1.FirstOrDefault(); } Then there is a very good reason to use Geography. Explanation of spatial within Entity Framework. Updated with Creating High Performance Spatial Databases As I noted on Noe...
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Pythonic way to create a long multi-line string

...de commas between the string segments, then it will be a tuple. query = ('SELECT action.descr as "action", ' 'role.id as role_id,' 'role.descr as role' ' FROM ' 'public.role_action_def,' 'public.role,' 'public.record_def, ' 'public.ac...
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Amazon EC2, mysql aborting start because InnoDB: mmap (x bytes) failed; errno 12

...EC2 Linux Micro instance. Since Micro instances have only 613MB of memory, MySQL crashed every now and then. After a long search about MySQL, Micro Instance and Memory Managment I found out there is no default SWAP space for Micro instance. So if you want to avoid the crash you may need to setup a s...
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记一次MongoDB性能问题 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术

...使用ext3,可能会遇到这类问题,所以还是大概介绍一下如何解决: MongoDB按需自动生成数据文件:先是<DB>.0,大小是64M,然后是<DB>.1,大小翻番到128M,到了<DB>.5,大小翻番到2G,其后的数据文件就保持在2G大小。为了避免可能出...
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Is there any difference between GROUP BY and DISTINCT

...CT and distinct by UNION cause an oracle error, but GROUP BY worked; I was selecting only 1 column from a view and not using any aggregation; I'm still baffled why it required it, but it does confirm there is some difference in the execution. As others point out, it also lets you GROUP BY columns no...
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关于密码那些事 - 轻松一刻 - 清泛网 - 专注C/C++及内核技术

关于密码那些事 密码 那些事
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Discuz 找回密码时提示参数错误 - 更多技术 - 清泛网 - 专注C/C++及内核技术

Discuz 找回密码时提示参数错误source module member member_getpasswd.php第32行找到$uid = $_GET['uid'];在下方添加一行$sign = $_GET['sign'];tem...source\module\member\member_getpasswd.php 第32行找到 $uid = $_GET['uid']; 在下方添加一行 $sign = $_GET['sign']; t...
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linux下清除svn的用户名和密码 - 更多技术 - 清泛网 - 专注C/C++及内核技术

linux下清除svn的用户名和密码问题:之前用的svn账号权限不够,需要使用别的账号,所以提出需求——怎么使用新的svn账号进行操作方法一:linux下删除~ subversion auth 问题:之前用的svn账号权限不够,需要使用别的账号,所以...
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phpcms v9与ucenter通信失败 完美解决 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...名:root (必填,视实际情况而定) Ucenter 数据库密码root (视实际情况而定) Ucenter 数据库名:discuz (必填,视实际情况而定) Ucenter 数据库表前缀:`discuz`.pre_ucenter_ (必填,视实际情况而定。如果此...
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App Inventor 2 UrsPahoMqttClient 拓展 - 物联网轻量级MQTT协议 · App Inventor 2 中文网

...户名 可选:用于身份验证的用户名。 UserPasword - 用户密码 可选:用于身份验证的用户密码。 SSL/TLS:服务器身份验证 使用 受信任的证书文件 和 信任库文件 属性设置服务器身份验证(使用 SSL/TLS 协议)。 受...