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sql - Mysql query to dynamically convert rows to columns

Can MySQL convert columns into rows, dynamically adding as many columns as are needed for the rows. I think ... one column to accommodate this extra data point. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - Uploading multiple files using formData()

var fd = new FormData(); fd.append("fileToUpload", document.getElementById('fileToUpload').files[0]); var xhr = new ... removing the [0], but it didn't work. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Can a const variable be used to declare the size of an array in C?

Why does the following code throw an error? const int a = 5; int b[a]={1,2,3,4,5}; And also when I tried ... a ROM (Flash, EEPROM...). What would happen then? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - How can I split a column of tuples in a Pandas dataframe?

I have a Pandas dataframe (this is only a little piece) >>> d1 y norm test y norm train len(y_train) len(y_test) 0 ... LCV-a and LCV-b. How can I do that? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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getselection - How to get selected html text with javascript?

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asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - What would a "frozen dict" be?

A frozen set is a frozenset. A frozen list could be a tuple. What would a frozen dict be? An immutable, hashable ... : https://www.python.org/dev/peps/pep-0603 Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Is there a limit on how much JSON can hold?

I am using jquery, JSON, and AJAX for a comment system. I am curious, is there a size limit on what you can send ... I allow users to use html, will this be ok? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - Converting dict to OrderedDict

I am having some trouble using the collections.OrderedDict class. I am using Python 2.7 on Raspbian, the Debian ... Python because it is just the Linux version. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Are delphi variables initialized with a value by default?

I'm new to Delphi, and I've been running some tests to see what object variables and stack ... always set procedure-level variables before accessing them? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - Print new output on same line

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asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Word frequency count Java 8

How to count the frequency of words of List in Java 8? List <String> wordsList = Lists.newArrayList("hello", "bye", "ciao ... must be: {ciao=2, hello=1, bye=2} Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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How to implement LIMIT with SQL Server?

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asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Spark SQL replacement for MySQL's GROUP_CONCAT aggregate function

I have a table of two string type columns (username, friend) and for each username, I want to collect all of its ... Is there any way to do this with Spark SQL? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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flash - differences between using wmode="transparent", "opaque", or "window" for an embedded object on a webpage

when embedding a Flash object with the <object> and <embed> tag, there is an attribute called wmode. It ... it but not the formal documentation. thanks. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c# - ASP.NET MVC: No parameterless constructor defined for this object

Server Error in '/' Application. ------------------------------------------------ ... should understand routing and controllers at a deeper level than I do now. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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jquery - Merge two json/javascript arrays in to one array

I have two json arrays like var json1 = [{id:1, name: 'xxx' ...}] var json2 = [{id:2, name: 'xyz' ...}] I want ... name: 'xxx' ...},{id:2, name: 'xyz' ...}] Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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How to control the width and height of the default Alert Dialog in Android?

AlertDialog.Builder builder = new AlertDialog.Builder(this); builder.setTitle("Title"); builder.setItems(items, new ... and manually set the width and height? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - What does the 'array name' mean in case of array of char pointers?

In my code: char *str[] = {"forgs", "do", "not", "die"}; printf("%d %d", sizeof(str), sizeof(str[ ... difference? Both str and str[0] are char pointers, right? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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git - How do I recover/resynchronise after someone pushes a rebase or a reset to a published branch?

We have all heard that one should never rebase published work, that it's dangerous, etc. However, I ... has committed substantial local changes on that branch? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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566 views

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How to capture the screenshot of a specific element rather than entire page using Selenium Webdriver?

Currently I'm trying to capture a screenshot using the Selenium WebDriver. But I can only obtain the whole ... a screenshot by selected item or element? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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185 views

1 answer

.net - How can I run an EXE file from my C# code?

I have an EXE file reference in my C# project. How do I invoke that EXE file from my code? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.3k views

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matplotlib - Scatter plot and Color mapping in Python

I have a range of points x and y stored in numpy arrays. Those represent x(t) and y(t) where t=0...T-1 ... the numpy arrays) What is the easiest way to do so? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dom - How do I check if an element is really visible with JavaScript?

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asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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312 views

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algorithm - How to calculate an angle from three points?

Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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css - Print page numbers on pages when printing html

I've read a lot of web-sites about printing page numbers, but still I couldn't make it display for my ... S. I have the latest supported versions of browsers. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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108 views

1 answer

How to upload multiple files using PHP, jQuery and AJAX

I have designed a simple form which allows the user to upload files to the server. Initially the form contains ... '.submit()' function will be really helpful. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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95 views

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sql server - Storing a file in a database as opposed to the file system?

Generally, how bad of a performance hit is storing a file in a database (specifically mssql) as opposed to the ... store my files as varbinaries in SQL Server. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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330 views

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.net - How can I create a self-signed certificate using C#?

I need to create a self-signed certificate (for local encryption - it's not used to secure communications), ... certificate store or export to a PFX file. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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