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ALTER TABLE to add a composite primary key
I have a table called provider . I have three columns called person , place , thing . There can be duplicate persons, duplicate places, and duplicate things, but there can never be a dupicate person-place-thing combination.
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图表组件 · App Inventor 2 中文网
...签，则使用默认值使用（该位置的轴刻度的 x 值）。
CSV字符串标签
指定要设置到图表 x 轴的标签，如果当前是一个带有 x 轴的图表。
标签被指定为逗号分隔（CSV格式）的值字符串，类似的用法参考标签列表。
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UnicodeEncodeError: 'latin-1' codec can't encode character
What could be causing this error when I try to insert a foreign character into the database?
9 Answers
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https connection using CURL from command line
I am new to Curl and Cacerts world and facing a problem while connecting to a server.
Basically, I need to test connectivity over https from one machine to another machine.
I have a URL to which I need to connect from Machine A (a linux machine)
I tried this on command prompt
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Get object by id()? [duplicate]
Let's say I have an id of a Python object, which I retrieved by doing id(thing) . How do I find thing again by the id number I was given?
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Get JSON object from URL
I have a URL that returns a JSON object like this:
11 Answers
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How to recursively delete an entire directory with PowerShell 2.0?
What is the simplest way to forcefully delete a directory and all its subdirectories in PowerShell? I am using PowerShell V2 in Windows 7.
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Using Vim's tabs like buffers
... have looked at the ability to use tabs in Vim (with :tabe , :tabnew , etc.) as a replacement for my current practice of having many files open in the same window in hidden buffers.
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Copy a stream to avoid “stream has already been operated upon or closed”
I'd like to duplicate a Java 8 stream so that I can deal with it twice. I can collect as a list and get new streams from that;
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MySQL Great Circle Distance (Haversine formula)
I've got a working PHP script that gets Longitude and Latitude values and then inputs them into a MySQL query. I'd like to make it solely MySQL. Here's my current PHP Code:
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