大约有 40,000 项符合查询结果(耗时:0.0180秒) [XML]

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How do I create a user with the same privileges as root in MySQL/MariaDB? [closed]

How do I create a user with the same privileges as root in MySQL/MariaDB?. 1 Answer 1...
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What are the use cases for selecting CHAR over VARCHAR in SQL?

...'123 Main St Washington, MD 12345', 123.45) create view vwStagingTable AS SELECT CustomerFirstName = CAST(CustomerFirstName as CHAR(30)), CustomerLastName = CAST(CustomerLastName as CHAR(30)), CustomerCityStateZip = CAST(CustomerCityStateZip as CHAR(100)), CustomerCurrentBalance = CAST(CAST(Custome...
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How to push both value and key into PHP array

...he table and here it is : //connect to db ...etc $result_product = /*your mysql query here*/ $array_product = array(); $i = 0; foreach ($result_product as $row_product) { $array_product [$i]["id"]= $row_product->id; $array_product [$i]["name"]= $row_product->name; $i++; } //yo...
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Can you create nested WITH clauses for Common Table Expressions?

..., the form of the statement you are looking for would be WITH x AS ( SELECT * FROM MyTable ), y AS ( SELECT * FROM x ) SELECT * FROM y share | improve this answer | ...
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构建高并发高可用的电商平台架构实践 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...综合考虑各种因素(是否满足高并发高性能,Session保持如何解决,负载均衡的算法如何,支持压缩,缓存的内存消耗);下面基于几种常用的负载均衡软件做个介绍。 LVS,工作在4层,Linux实现的高性能高并发、可伸缩性、可靠...
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libevent对比libev的基准测试 - C/C++ - 清泛网 - 专注C/C++及内核技术

...libevent 每次迭代的总时间增加得快得多,无论客户端数量如何,花费的时间几乎是 libev 的两倍。不过,两者都表现出相似的增长特征。 轮询时间也非常相似,libevent 在 1000-fd 情况下始终较慢,而在 100-fd 情况下,时间几乎相同...
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How can I stop a running MySQL query?

I connect to mysql from my Linux shell. Every now and then I run a SELECT query that is too big. It prints and prints and I already know this is not what I meant. I would like to stop the query. ...
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MySQL ('root'@'%') does not exist 的问题 - 爬虫/数据库 - 清泛IT社区,为创新赋能!

MySQL ('root'@'%') does not exist的问题: 在使用mysql时出现问题: The user specified as a definer ('root'@'%') does not exist。 一般是由于root用户对全局host无访问权限。因此只要给root用户添加一个访问权限即可。 解决办法: 登陆mysql ,...
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MySQL integer field is returned as string in PHP

... When you select data from a MySQL database using PHP the datatype will always be converted to a string. You can convert it back to an integer using the following code: $id = (int) $row['userid']; Or by using the function intval(): ...
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How to combine two or more querysets in a Django view?

...s. For example: >>> qs1.union(qs2, qs3) The UNION operator selects only distinct values by default. To allow duplicate values, use the all=True argument. union(), intersection(), and difference() return model instances of the type of the first QuerySet even if the arguments ...