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一个故事告诉你比特币的原理及运作机制 - 创意 - 清泛网 - 专注C/C++及内核技术

...这样以物易物实在太不方便了,于是村子全员开会,讨论如何解决这个问题。有人提议,以便于分割且稀有的东西,例如黄金,作为一般等价物,把其它物品和黄金的对应关系编成一张表格,例如一克黄金对应一只羊,一克黄金...
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What is maximum query size for mysql?

What is maximum query size for mysql? Some times the server stops working when I fire a too long query. 2 Answers ...
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FIND_IN_SET() vs IN()

...ould even use an index on companyID. Unfortunately, this does not work in MySQL since the latter does not support arrays. You may find this article interesting (see #2): 10 things in MySQL (that won’t work as expected) Update: If there is some reasonable limit on the number of values in the...
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Select last N rows from MySQL

I want to select last 50 rows from MySQL database within column named id which is primary key . Goal is that the rows should be sorted by id in ASC order, that’s why this query isn’t working ...
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How to delete a certain row from mysql table with same column values?

I have a problem with my queries in MySQL. My table has 4 columns and it looks something like this: 6 Answers ...
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How to log PostgreSQL queries?

... that mean PostgreSQL can't enable logging unless I restart the server? In MySQL, it is as simple as "SET GLOBAL general_log = 'ON';" – Antony Dec 7 '11 at 22:41 7 ...
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Read properties file outside JAR file

...am is main.jar and its main properties file is main.properties): ./ - the root of your program |__ main.jar |__ main.properties With this architecture, you can modify any property in the main.properties file using any text editor before or while your main.jar is running (depending on the curren...
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cpuid汇编指令 - C/C++ - 清泛网 - 专注C/C++及内核技术

...一组返回的是基本信息,另一组返回的是扩展信息。 1、如何判断CPU是否支持CPUID指令 前面说过,大概是从80486开始才有的cpuid这个指令,是不是所有的80486家族CPU都有这个指令我也不是很清楚,但在EFLAGS中的bit 21可以识别CPU...
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PDO mysql: How to know if insert was successful

I'm using PDO to insert a record (mysql and php) 7 Answers 7 ...
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Update date + one year in mysql

When I want setting numerical value +1 in mysql table, I use e.g.: 3 Answers 3 ...