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数据库结构如下所示 course表 sc表 student表 laravel的sql语句代码 $get_all = sc::leftJoin("student", "sc.sid", "=", "student.snum") ->Join("course", "sc. ... 程最高成绩的学生信息，，，但是不知道怎么做还望大神指点，，，，什么方法都行...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - Check string in select option

I have created with javascript and I get a result of a string.I get that result on my html code <div id="results">< ... /select> <input id="results" type="submit" value="results"/>...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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swift - SwiftUI List updating slowly

I have a SwiftUI List, which has thousands of items. Each item is as such: class Item: Codable, Identifiable { ... 't seem to support that. Any suggestions are greatly appreciated....

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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JS拼写字符串

data-options="required:true, validType:['int','maxLength[2]']" JS拼写这句话...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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azure machine learning service - Failure reading parquet files

Azure ML fails to read tabular data set from parquet files, many parquet files. Creating datasets ... )] tabular_dataset = Dataset.Tabular.from_parquet_files(path=datastore_path)...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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请教各位，python编写爬虫，返回http error 521怎么解决

import urllib.request import urllib.parse import urllib.error import re import random def open_url(url): req_header = {' ... urlopen（）处出现异常 urllib.error.HTTPError: HTTP Error 521:...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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What is the difference between single-quoted and double-quoted strings in PHP?

I'm a little confused why I see some code in PHP with string placed in single quotes and sometimes in double quotes. I ... single quote, that means it is a character, not a string....

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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{}、+{}、[]、+[]在javascript中的含义

function test(){ return (+{}+[])[1]; //返回a } 有如上一段js代码，想知道的是为什么返回值是"a"？...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - Executing multi-line statements in the one-line command-line?

I'm using Python with -c to execute a one-liner loop, i.e.: $ python -c "for r in range(10): print 'rob'" This ... have this as a one-liner so that I can include it in a Makefile....

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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migration - Trying to import Issues from JIRA to Redmine

Following this: https://www.redmine.org/issues/1385#note-43 I have been trying to run the following query: rake jira_migration: ... C:/RailsInstaller/Ruby2.3.3/bin/rake:22:in `'...