草庐IT

sql - "people you may know"sql查询

我正在开发“您可能认识的人”功能。我有两个表:用户编号电子邮件姓名等等友谊用户编号friend_id对于每一份友谊,我都会做两份记录。假设用户7和9成为friend...我会在友谊表中记录user_id=7、friend_id=9和另一个user_id=9、friend_id=7。我如何进行sql查询以根据我friend的friend推荐我可能认识的人?我还希望它根据最共同的friend排序。 最佳答案 selectu.id,u.email,u.name,u.etc--GetallmyfriendsfromFriendshipsas

ios - GLSL 着色器错误 "Constructor calls may not have precision"

GLSL着色器错误错误:0:1:'(':语法错误:构造函数调用可能没有精度我在基于GLPaint演示的iOS8应用程序上使用Xcode6看到此错误...(在iOS7中工作正常)我还注意到他们在GLPaint演示版本1.13中不再使用“STRINGIFY”。.vshstaticconstchar*BaseVS=STRINGIFY(attributehighpvec4inVertex;uniformhighpmat4MVP;uniformhighpfloatpointSize;uniformhighpvec4vertexColor;uniformhighpfloatbrushRotatio

vivado板子连接报错no active target may be locked by another hw_server

vivado连接板子点击autoconnect后错误ERROR:[Labtoolstcl44-494]Thereisnoactivetargetavailableforserveratlocalhost.Targets(s)",jsn-JTAG-SMT2-210251A08870"maybelockedbyanotherhw_server.解决方法Ctrl+Alt+Delete打开任务管理器找到进程hw_server.exe,关闭它重新点autoconnect说明这个进程占用了板子,使得vivado连接失败,关掉重连即可。这种情况偶尔发生,原因不明。

swift - 操作系统 : Objects inside view based table views may only be connected to to the table view's delegate

我已经设置了一个带有嵌入式NSTableView的NSView。我已尝试为NSTableViewCell设置一个操作,以便在对TableView单元格进行更改时运行:importCocoaclassMyView:NSView{overridefuncdrawRect(dirtyRect:NSRect){super.drawRect(dirtyRect)}@IBActionfuncvalEntered2(sender:AnyObject){Swift.print("valueEntered2")}}虽然这种方法以前在Storyboard上使用NSViewController时效果很好,但

报错:The Tomcat connector configured to listen on port xxxx failed to start. The port may already be

APPLICATIONFAILEDTOSTARTDescription:TheTomcatconnectorconfiguredtolistenonportxxxxfailedtostart.Theportmayalreadybeinuseortheconnectormaybemisconfigured.Action:Verifytheconnector’sconfiguration,identifyandstopanyprocessthat’slisteningonportxxxx,orconfigurethisapplicationtolistenonanotherport.原因:当遇到T

java - JBoss 工具部署错误 : This may be caused by your server's temporary deploy directory being on a different filesystem than the final destination

在Eclipse中使用JBoss工具部署应用程序时出现以下错误:ErrorrenamingC:\wildfly-8.1.0.Final\standalone\tmp\tmp7858611943756287857.xhtmltoC:\wildfly-8.1.0.Final\standalone\deployments\.war\403.xhtml.Thismaybecausedbyyourserver'stemporarydeploydirectorybeingonadifferentfilesystemthanthefinaldestination.Youmayadjusttheses

conda激活环境报错:IMPORTANT: You may need to close and restart your shell after running ‘conda init‘.

conda激活环境报错 :CommandNotFoundError:Yourshellhasnotbeenproperlyconfiguredtouse'condaactivate'.Ifusing'condaactivate'fromabatchscript,changeyourinvocationto'CALLconda.batactivate'.Toinitializeyourshell,run$condainitCurrentlysupportedshellsare:-bash-cmd.exe-fish-tcsh-xonsh-zsh-powershellSee'condainit--h

The Tomcat connector configured to listen on port 10000 failed to start. The port may already be in

一、原因今天在学谷粒商城,启动一个电商项目,发现一个端口被占用了,记录下来二、解决方法1、以管理员身份打开cmd2、输入:netstat-ano|findstr“PID”3、输入:tasklist|findstr“2552”。4、taskkill/T/F/PID2552。5:端口占用问题解决。

python - 返回数组中子数组的索引

我将Python与numpy结合使用。我有一个numpy数组may_a:may_a=numpy.array([False,True,False,True,True,False,True,False,True,True,False])我有一个numpy数组may_b:may_b=numpy.array([False,True,True,False])我需要在数组may_a中找到数组may_b。在输出中我需要获取出现的索引。out_index=[2,7]有人可以建议,我如何获得out_index? 最佳答案 编辑以下代码允许执行基于卷积

python - 将 JSON 读取到 pandas 数据框 - ValueError : Mixing dicts with non-Series may lead to ambiguous ordering

我试图将下面的JSON结构读入pandas数据框,但它抛出了错误消息:ValueError:Mixingdictswithnon-Seriesmayleadtoambiguousordering.Json数据:{"status":{"statuscode":200,"statusmessage":"EverythingOK"},"result":[{"id":22,"club_id":16182},{"id":23,"club_id":16182},{"id":24,"club_id":16182},{"id":25,"club_id":16182},{"id":26,"club_id