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sql - How can we add NULL as a value for a field on snowflake that accepts null value if its type is datetime

I am trying to load some data from a stage into a table having the following DDL: CREATE TABLE IF NOT EXISTS SAT_COUNTRY_PROGRAMME ... to use 'NULL' and '' but got the same error....

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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请问css 这种效果有什么方便的写法么

主要是两端圆点...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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pip install dolphindb一直提示找不到

为什么一直找不到,其它电脑可以正常安装. ERROR: Could not find a version that satisfies the requirement dolphindb (from versions: none) ERROR: No matching distribution found for dolphindb...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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android paho mqtt 同一界面多次进入，仍然会请求上次进入界面的主题？

假设首次进入设备01 的设置界面读取了实时的设置，返回列表再进入设备02 的设置，sdk先发一次 02 的主题，再发一次01 的主题，最终显示的数据是 01 的数据。试过在 onDestroy 中取消订阅、断开连接，都不太合适。，...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - Pandas group by rersample aggregation with sum by date and index

I have a complicated problem with pandas.I would like to calculatea cumlative sum depending on the timestamp start_date concerning that we ... 7:10 4600.0 2015-04-18 8:00 6900.0...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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一年数据接近1个亿非结构化数据的场景，用的什么数据库合适？

我们想要全面的记录用户行为，之前买过成熟的统计分析工具（类似百度站长），但想要的很多功能没有，很多不需要的功能倒是挺多的，结果就是成本不低但达不到我们的预期所以考虑自己做套简易的收集系统，搭配本身系统自身能够把数据维度做多一些 ... 写入就不会再更改了非结构化数据量大这些特性出发有没有更合适的简单点的数据库呢莫非必须得走Hbase这些大件才行么？...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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pdf generation - Angular 8 Generating HTML to PDF error using jsPDF

I am using angular 8 I am trying pdf generator but I am facing an issue My Html part is <div id="content" #content> <h1> ... , 'pt', 'letter'); Help me to solve this.... thankyou...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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memory - C++ : Alternative to constructor initializer lists without assignment?

I'm facing the following problem: I want to pass the _partHandlePtr to the constructor of _currUnmanaged and ... Handle>> _partHandlePtr; } Thanks for suggestions and solutions!...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - how to convert a x^2 long list to a list of shape (x,x)

Im in python, I have a list with a length 784 (which i extracted from a 28x28 image ) and now i want to ... data is 784 elements long and i dont have much experince in numpy...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - I can't modify a variable in a function so when it return to the main the condition of while is never satisfied

Basically i want the variable 'End' to control the while loop. In the while loop there is a function called to check ... to use pointers. The variable End was int End = 0;...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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后端如何管理文件？

要做一个用户上传文件的库需求是一个“文件对象”对应一个文件（file），文件名，上传时间，上传用户以及内部的文件路径和名字数量可能会很大该如何管理这些文件？...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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vue中:style样式绑定为什么不起作用？

请问下为什么变成80px没有折叠起来呢？...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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egg错误处理后没有返回结果

按照文档： https://eggjs.org/zh-cn/core/... 写了统一处理错误： onerror: { all(err, ctx) { console.log(111199, err); ctx.status = 500; ctx.body = { ... err都能打印出来，说明错误被捕捉到了但是一直没有返回500状态给前端如何解决？...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Calling object method passing superclass where subclass expected

For example i have three classes class Shape { static bool collide(Box * a, Box * b) static bool collide ... downcast objects given as argument without adding too much logic?...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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创建不成功package.json

...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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keras - how to train a custom model for few shot using Reptile?

I am new to few-shot learning, and I wanted to get a hands-on understanding of it, using Reptile algorithm, applied ... dataset with only 30?5=150 images for training? Kindly help....

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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求助大佬们，一台电脑可以上网，局域网下，如何让另外一台电脑也可以上网？

场景：一台Mac笔记本电脑可以wifi连接互联网，一台ubuntu台式电脑不能联网，两台电脑在同一个局域网下，怎么让台式电脑通过笔记本电脑实现访问互联网？在网上查到的说可以用网关做代理，但我试了半天也没好使（是我太笨了?），求大佬支招?。我的配置： mac共享设置 mac网络配置 ubuntu网络配置...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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"Token is expired or invalid" when trying to server-side validate Huawei subscription

I'm trying to do a server-side verification of Huawei subscription, but currently I'm stuck at verification part Im ... or invalid accessToken? Please help me with this, thanks!...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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axios的回调是否有不妥之处

axios({ }).then((response)=>{ }).catch((error)=>{ }); 尽管多数文档里给出的回调方式都是如此，但这样的回调并不能像ajax的done()和fail()那样将错误信息区分开来最近在 ... 也会执行then()里的内容而我想知道是的axios的回调能否有想ajax的done()和fail()这样的回调方式...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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3.0k views

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java - How to save data from JEditorPane?

So first of all I want to use my JEditorPane as a "note field" and I want it to save the text, so I still can ... (Paths.get(fileName)))) { return ois.readObject(); } } }...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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create-react-app 生成的react 项目，每个组件文件下都会生成一个dist文件，怎么去掉

create-react-app 生成的react 项目，每个组件文件下都会生成一个dist文件，怎么去掉。这个文件里面是编译好的js 和 css。发布的时候也不会带上他们，有什么用。如果去不掉怎么在git里把这些文件夹全部忽略掉...

asked Jan 25, 2021 in Technique[技术] by 深蓝 (71.8m points)

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使用pandas读取excel出现xlrd.biffh.XLRDError是什么问题

xlsx格式的可以正常打开是哪里的问题，怎么解决？...

asked Jan 25, 2021 in Technique[技术] by 深蓝 (71.8m points)

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3.9k views

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vue3中如何修改eslint?

我是用是prettier 这是我.eslintec.js module.exports = { root: true, env: { node: true }, extends: [ "plugin:vue/vue3-essential", " ... 个怎么处理我感觉是prientWidth的问题, 但是修改rules和vscode的设置都没用...

asked Jan 25, 2021 in Technique[技术] by 深蓝 (71.8m points)

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unit testing - JenkinsPipelineUnit helper can intercept text param call but not string param call

How can I get JenkinsPipelineUnit to intercept both text() and string() param calls? I have code that triggers ... Results [ [name:JOB_PROPERTIES, value: line1 line2] ]...

asked Jan 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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vue如何监听sessionStorage

我在public文件夹里面的js文件里用sessionStorage存储了一个参数，想在vue页面里监听这个参数变化，请问怎么监听？...

asked Jan 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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4.5k views

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asp.net core - Integration testing loading mock data from root folder

I have written one GET API which loads the json data from wwwroot/data/data.json. It works fine when I do testing ... be great if someone could proivde a simple example on this....

asked Jan 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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js 怎么样将得到的obj对象变量转化为文档流呢

js 怎么样将得到的obj对象变量转化为文档流呢今天遇到一个需求table 列表将选中的行对象，如： val data = [ {xxx:xx}, {xxx:xx}, {xxx:xx} ] 将变量转为blob文件流，然后下载成Excel文件...

asked Jan 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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3.3k views

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docker 镜像启动后立即访问地址失败需要重新刷新几次或等待几秒才能访问

正学习使用 docker-py 开发容器管理应用，用户在前端页面点击启动容器，后端 api 收到请求后让某个镜像按照指定 ip 和端口启动然后返回前端用户指定的 ip 和端口的 json 响应 ... docker inspect congtainerid 判断 running 状态？哪位大佬可以写个 vue + django 关键说明代码啊？非常感谢！...

asked Jan 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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