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创业 比“直男癌”更可怕的是“技术癌” - 资讯 - 清泛网 - 专注C/C++及内核技术
...来的壁垒和防线。
预告：在后面的文章里，AA投资将对如何优化商业模式这个问题进行系统的介绍，分析如何通过找到现有商业模式的问题，寻找解决问题的路径，并实现商业模式的优化。
创业
Explicit vs implicit SQL joins
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On MySQL 5.1.51, both queries have identical execution plans:
mysql> explain select * from table1 a inner join table2 b on a.pid = b.pid;
+----+-------------+-------+------+---------------+------+---------+--------------+---...
What is the difference between Amazon S3 and Amazon EC2 instance?
I need to create a web application using php mysql and html. The no.of requests and data will be very high. I need Amazon server space.
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Convert a date format in PHP
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What if I get this date 0000-00-00 from mySQL? it returns a wrong date like 31/12/1969 ...
– Enrique
Apr 29 '10 at 22:20
3
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What data type to use for hashed password field and what length?
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You can actually use CHAR(length of hash) to define your datatype for MySQL because each hashing algorithm will always evaluate out to the same number of characters. For example, SHA1 always returns a 40-character hexadecimal number.
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ALTER TABLE to add a composite primary key
...r table you will get an error when trying to drop it. In some versions of mysql the error message there was malformed (as of 5.5.17, this error message is still
alter table parent drop column id;
ERROR 1025 (HY000): Error on rename of
'./test/#sql-a04_b' to './test/parent' (errno: 150).
If you ...
Wi-Fi 是什么的缩写 - 程序人生、谈天论地 - 清泛IT论坛，有思想、有深度
...的标准，也就是我们常见到的 802.11 系列，但却没有规定如何去测试产品是否符合标准，导致 802.11 产品间的互通频频出现问题，而联盟的成立就是为了填补这一空缺。联盟还将推广符合 802.11 标准的无线网络技术作为己任，因此...
为什么大数据也不能帮你摆脱单身狗的命运？ - 资讯 - 清泛网 - 专注C/C++及内核技术
...单身狗的命运？】今天是虐狗节，去年看过一篇文章，讲如何通过大数据找到你的另一半(见参考资料)！里面通过理性建模和精准定位找到合适伴侣，不过大数据真有这么神奇么？我就随便聊聊约会App算法和现实中策略。今天是...
HAproxy - Web负载均衡解决方案 - 更多技术 - 清泛网 - 专注C/C++及内核技术
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stats auth admin:password
# 设置统计页面认证的用户和密码，如果要设置多个，另起一行写入即可
stats hide-version
# 隐藏统计页面上的haproxy版本信息
frontend http_80_in # 定义一个名为http_80_in的前端部分
bind 0.0.0.0:80
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How to get last inserted row ID from WordPress database?
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Putting the call to mysql_insert_id() inside a transaction, should do it:
mysql_query('BEGIN');
// Whatever code that does the insert here.
$id = mysql_insert_id();
mysql_query('COMMIT');
// Stuff with $id.
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