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CHECK constraint in MySQL is not working
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MySQL 8.0.16 is the first version that supports CHECK constraints.
Read https://dev.mysql.com/doc/refman/8.0/en/create-table-check-constraints.html
If you use MySQL 8.0.15 or earlier, the MySQL Reference Manual says:
The CHECK...
Why is Double.MIN_VALUE in not negative
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edited Dec 13 '10 at 10:22
answered Oct 7 '10 at 18:53
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Is it possible to embed animated GIFs in PDFs?
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I haven't tested it but apparently you can add quicktime animations to a pdf (no idea why). So t...
How to convert int[] to Integer[] in Java?
...[] can be converted to Integer[] easily:
int[] data = {1,2,3,4,5,6,7,8,9,10};
// To boxed array
Integer[] what = Arrays.stream( data ).boxed().toArray( Integer[]::new );
Integer[] ever = IntStream.of( data ).boxed().toArray( Integer[]::new );
// To boxed list
List<Integer> you = Arrays.str...
Convert Existing Eclipse Project to Maven Project
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140
If you just want to create a default POM and enable m2eclipse features: so I'm assuming you do n...
Is there a fixed sized queue which removes excessive elements?
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edited May 23 '17 at 12:02
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answered Dec 26 '09 at 17:08
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What's the best way to iterate over two or more containers simultaneously
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How to append text to a text file in C++?
...:app); // append instead of overwrite
outfile << "Data";
return 0;
}
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MFC中通过Tooltip类实现悬浮鼠标显示提示信息 - C/C++ - 清泛网 - 专注C/C++及内核技术
...法如下：
1、在窗口中增加消息映射ON_NOTIFY_EX(TTN_NEEDTEXT, 0, SetTipText)
SetTipText是个回调函数，名字叫什么无所谓，符合原型就行了，原型下面会说。
2、EnableToolTips(TRUE)，使用这个方法调用这个函数是必不可少的.建议在CDialog...
内网时间同步问题 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...以下方法进行时间调整：
* 如果它确定时钟偏差超过 0.5 秒，它通过调用 settimeofday 子例程设置时钟时间。在引导时间，这是一个首选的方法。
* 如果它确定时钟偏差小于 0.5 秒，它通过调用 adjtime 子例程和偏移量来调整...