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MIT已发布v2.75版本，中文网已同步升级最新版本 - App Inventor 2 中文网 -...
...因此，曲线拟合组件必须与图表组件及图表数据组件一同使用。
曲线拟合组件有四种不同的模型可供选择，如下图所示，即：线性函数、二次函数、指数函数及对数函数。
随便为图表数据组件设置了三组数据：2,9,6,14,12,...
CustomWebView拓展：WebViewer的扩展版本，具有更高的自定义性和灵活性 - A...
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How do I connect to a MySQL Database in Python?
How do I connect to a MySQL database using a python program?
23 Answers
23
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Reusing a PreparedStatement multiple times
...mmon connection without any pool, can I recreate an instance for every dml/sql operation mantaining the power of prepared statements?
...
How do I do a bulk insert in mySQL using node.js
How would one do a bulk insert into mySQL if using something like
https://github.com/felixge/node-mysql
12 Answers
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Linux下安装项目管理工具Redmine - 开源 & Github - 清泛网 - 专注C/C++及内核技术
...ux下安装项目管理工具Redmine1、Ruby安装Ruby on Rails网站推荐使用1.8.7版。点击(此处)折叠或打开# wget ftp: ftp.ruby-lang.org ...Linux下安装项目管理工具Redmine
1、Ruby安装
Ruby on Rails网站推荐使用1.8.7版。
# wget ftp://ftp.ruby-lang.org...
Why use multiple columns as primary keys (composite primary key)
...ebate" is not stupid. It's a very valid issue from developers that are not sql developers or sql DBA's and don't spend all their time in sql. Even in pure sql I'd rather have a meaningless auto-generated key as the primary key when joining than have to remember to pass n bits of data around being th...
Is storing a delimited list in a database column really that bad?
...nt table-scan. May have to resort to regular expressions, for example in MySQL:
idlist REGEXP '[[:<:]]2[[:>:]]'*
Hard to count elements in the list, or do other aggregate queries.
Hard to join the values to the lookup table they reference.
Hard to fetch the list in sorted order.
To solve thes...
How to ALTER multiple columns at once in SQL Server
...simple metadata change. You are welcome to join my lecture tomorrow about "SQL Internals - Physical Table Structure under the hood, and implementation on real case scenarios" to see it all in practical :-)
– Ronen Ariely
Mar 12 '19 at 17:19
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django syncdb and an updated model
...m using South for migrating models with a custom db backend (like django-mssql)
– Don
Apr 4 '11 at 7:32
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