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Is there a REAL performance difference between INT and VARCHAR primary keys?
...ver changes over time and would be a good candidate for a primary key. But bitter experience is that is seldom so.
INT AUTO_INCREMENT meets the "unique and unchanging over time" condition. Hence the preference.
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Convert base-2 binary number string to int
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Another way to do this is by using the bitstring module:
>>> from bitstring import BitArray
>>> b = BitArray(bin='11111111')
>>> b.uint
255
Note that the unsigned integer is different from the signed integer:
>>> b.int
-1
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Qt入门教程_详细讲解版 PDF - 文档下载 - 清泛网 - 专注C/C++及内核技术
Qt入门教程_详细讲解版 PDFQt 入门教程全文通过两个实例循序渐进讲述了QT开发的基本过程，通俗易懂，入门必备。全文通过两个实例（Linux环境）循序渐进讲述了QT开发的基本过程，通俗易懂，入门必备。WinXP,Win7,Win8,Win10493K
Effects of changing Django's SECRET_KEY
...t key needs to be the same size as the output. The key also needs to be in bits. Each digit in base64 represents 6 bits. So if you had a 50 character password, you would have a 50 x 6 = 300 bit secret key. If you are using SHA256, then you would need a 256 bit key (sha256 uses 256 bits by definition...
Why do we use Base64?
...encodings were created (e.g. Baudot code) which used a different number of bits per character until eventually ASCII became a standard with 7 bits per character. However most computers store binary data in bytes consisting of 8 bits each so ASCII is unsuitable for tranferring this type of data. Some...
Can't compile project when I'm using Lombok under IntelliJ IDEA
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I had to stop my Win10 for a freeze issue (pilot crash) and IntelliJ was opened. At restart, I guess idea files in my project directory has been altered (workspace.xml) and after that I couldn't generate my getters/setters methods via lombok....
How to write log base(2) in c/c++
... you're looking for an integral result, you can just determine the highest bit set in the value and return its position.
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How to color System.out.println output? [duplicate]
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Note
You may not be able to color Window's cmd prompt, but it should work in many unix (or unix-like) terminals.
Also, note that some terminals simply won't support some (if any) ANSI escape sequences and, especially, 24-bit colors.
Usage
Please refer to t...
printf() formatting for hex
...re's certainly a case to be made for using 16 instead of 12 in portable 64-bit code (but you'd use 8 for 32-bit code).
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Android adb not found
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On Linux, Android SDK platform-tools package containing adb used to be 32bit. It worked fine on 32bit systems. But on 64bit systems you need to manually install the IA32 library.
For Debian based distributions try this:
sudo apt-get install libc6-i386 lib32stdc++6 lib32gcc1 lib32ncurses5
But s...