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解决CentOS7,EFI+GPT卡在grub,无法正常启动的故障(一)
本文介绍了在CentOS7的efi+gpt模式下,如何修复grub2的方法。提供了 grub2-install:错误: /usr/lib/grub/x86_64-efi/modinfo.sh doesn‘t exist. Please specify --target or --directory. 的解决办法。我在网上没有搜索到这个报错的解决范例。
分类:其他好文   时间:2020-05-13 09:29:13    阅读次数:436
SQL查询存在A表但不存在B表的数据
其中B表的b_id字段引用了A表的id字段。现在有个查询需求: 给出已知的A表中的id,比如:id in (1,2,3),找出这些id在B表中没有与之对应的记录。比如说上面A表中的id=3这条记录,B表中没有b_id与之对应 方式一.利用子查询 SELECT a.id FROM A a WHERE ...
分类:数据库   时间:2020-05-13 09:18:02    阅读次数:528
【考研英语阅读精读100篇】2007 法律类 #1 LOCK 'EM UP!
A white kid sells a bag of cocaine at his suburban high school. A Latino kid does the same in his innercity neighborhood . Both get caught. Both are f ...
分类:其他好文   时间:2020-05-12 20:23:50    阅读次数:63
Does the 64-bit processor always perform better than 32-bits?
Abstract: What do you think about the question? Does the 64 bits always do better? The answer is NO. When we talk about 64 bit vs. 32 bit we mean two ...
分类:其他好文   时间:2020-05-12 20:12:53    阅读次数:84
When does a C# Task actually start?
When does a C# Task actually start? Calling an async method returns a hot task, a task that has already been started. So there is no actual code neces ...
分类:Windows程序   时间:2020-05-12 17:18:17    阅读次数:102
libpng warning: iCCP: cHRM chunk does not match sRGB
1 #include <opencv2/opencv.hpp> 2 using namespace cv; 3 int main() { 4 Mat img = imread("D:/test/1.jpg"); 5 imshow("ff",img); 6 waitKey(0); 7 return 0 ...
分类:其他好文   时间:2020-05-12 17:05:31    阅读次数:1358
array_key_exists — 检查数组里是否有指定的键名或索引
说明 array_key_exists ( mixed $key , array $array ) : bool 数组里有键 key 时,array_key_exists() 返回 TRUE。 key 可以是任何能作为数组索引的值。https://www.bzddrive.com/news/1468 ...
分类:编程语言   时间:2020-05-11 14:54:22    阅读次数:63
找规律
题目 You are given a positive integer N(1≦N≦1e18). Find the number of the pairs of integers u and v(0≦u,v≦N) such that there exist two non-negative inte ...
分类:其他好文   时间:2020-05-11 13:07:17    阅读次数:68
03-树3 Tree Traversals Again (25分)
An inorder binary tree traversal can be implemented in a non-recursive way with a stack. For example, suppose that when a 6-node binary tree (with the ...
分类:其他好文   时间:2020-05-11 12:57:57    阅读次数:76
Linux MySQL8 Unknown system variable 'validate_password_policy'Your password does not satisfy
1. 安装好mysql8.0 之后 , 用临时密码登进去 发现改密码不行 , 修改密码策略也不行 , 你需要 ,这样改密码 ALTER USER 'root'@'localhost' IDENTIFIED BY 'root_123R'; 然后再运行以下指令 set global validate_p ...
分类:数据库   时间:2020-05-11 00:48:51    阅读次数:103
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