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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
...分析、流控、风险控制等领域。电商平台系统或者应用对日常产生的大量日志和异常信息，需要经过实时过滤、分析，以判定是否需要预警；
同时需要对系统做自我保护机制，比如对模块做流量的控制，以防止非预期的对系统...
动态追踪（Dynamic Tracing）技术漫谈 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...“花园小径”当中，只见树木，不见森林。
所以，对于日常的开发过程当中的调试，其实我们还是推荐最简单也是看起来最笨的方法，即在关键代码路径上打印输出语句。这样我们通过查看日志等输出得到一个有很完整的上下...
What is the single most influential book every programmer should read? [closed]
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Code Complete (2nd edition) by Steve McConnell
The Pragmatic Programmer
Structure and Interpretation of Computer Programs
The C Programming Language by Kernighan and Ritchie
Introduction to Algorithms by Cormen, Leiserson, Rivest & Stein
Design Patt...
what is the difference between GROUP BY and ORDER BY in sql
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ORDER BY alters the order in which items are returned.
GROUP BY will aggregate records by the specified columns which allows you to perform aggregation functions on non-grouped columns (such as SUM, COUNT, AVG, etc).
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SQL Server: Difference between PARTITION BY and GROUP BY
I've been using GROUP BY for all types of aggregate queries over the years. Recently, I've been reverse-engineering some code that uses PARTITION BY to perform aggregations. In reading through all the documentation I can find about PARTITION BY , it sounds a lot like GROUP BY , maybe with a ...
Is it possible to GROUP BY multiple columns using MySQL?
Is it possible to GROUP BY more than one column in a MySQL SELECT query? For example:
7 Answers
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What's the difference between passing by reference vs. passing by value?
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First and foremost, the "pass by value vs. pass by reference" distinction as defined in the CS theory is now obsolete because the technique originally defined as "pass by reference" has since fallen out of favor and is seldom used now.1
Newer languages2 ...
Is Ruby pass by reference or by value?
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In traditional terminology, Ruby is strictly pass-by-value. But that's not really what you're asking here.
Ruby doesn't have any concept of a pure, non-reference value, so you certainly can't pass one to a method. Variables are always references to objec...
Is it better in C++ to pass by value or pass by constant reference?
Is it better in C++ to pass by value or pass by constant reference?
10 Answers
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Using group by on multiple columns
I understand the point of GROUP BY x .
2 Answers
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